Answer:
The correct option is D. (Two back-to-back phospholipid layers with the polar heads facing out on both sides)
Explanation:
The plasma membrane creates a barrier between the interior part of the cell and the cytoplasm. It is consisting of proteins and phospholipids and bi-layered in nature. Phospholipids are known as the main component of the plasma membrane.
Phospholipids are composed of alcohol and fatty acids and they are arranged in a specific manner. Each phospholipid molecule contains a water-hating tail that is hydrophobic in nature and a water-loving head which is hydrophilic in nature and the polar heads face the outside.
Final answer:
The correct arrangement is two back-to-back phospholipid layers with the polar heads facing out on both sides, forming a phospholipid bilayer that acts as a barrier, maintaining the integrity of the cell. The correct option is d.
Explanation:
The correct phospholipid arrangement that makes the most sense, given that water exists on both the outside and inside of a cell, is d. The cell membrane is composed of a phospholipid bilayer. In this structure, the hydrophilic (water-loving) polar heads of the phospholipids face the aqueous environments of the cell's interior and exterior, while the hydrophobic (water-fearing) non-polar tails face inward, away from the water, creating a nonpolar region between both layers. This arrangement is critical because it allows the plasma membrane to act as an effective barrier to separate cellular contents from the external environment, maintaining the integrity of the cell in its water-based surroundings.
A single-celled organism isolated from a deep-sea, hot thermal vent was found to have a cell wall but lacked a nucleus. This organism is most likely a member of which of the following domains?
Answer:
Archaea
Explanation:
Three main domains exist according to classification, two of these domains are characterized to contain organisms that do not have a membrane bound nucleus, in other words, their single circular genetic material (DNA) is not housed by a nucleus. Instead, the naked DNA is found localized to a central region in the cytoplasm called NUCLEOID. These domains are bacteria and archaea domains and they are termed to be PROKARYOTIC.
These domains also lack membrane bound organnelles i.e their few present organnelles are not bounded by lipid layer. Archaea and Bacteria both have cell walls but what makes up the cell wall is different in both organisms. The organism will most likely be an archaea because it portrays its characteristics being that, an archaea is a unicellular prokaryotic organism with a cell wall. It also has the ability to thrive in extremely harsh conditions like the hot thermal vent described in the question.
The single-celled organism described is most likely a member of the Archaea domain due to its lack of a nucleus and the presence of a cell wall. Archaeans are known to thrive in extreme environments.
Explanation:The single-celled organism you described, that has been isolated from a hot thermal vent in the deep sea and possesses a cell wall but lacks a nucleus, is most likely a member of the Archaea domain. The major characteristics of the Archaea include a lack of nucleus or other membrane-bound organelles, presence of unique lipids in their cell membrane, a distinctive cell wall, and their ability to thrive in extreme conditions, like high temperatures.
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Which protective covering of the brain provides passageways for cerebrospinal fluid (CSF) to drain into the superior sagittal sinus?a. periosteal part of the dura materb. membranous part of the dura materc. arachnoid materd. pia mater
Answer:
The correct answer is C) arachnoid mater.
Explanation:
Arachnoid mater, along with pia mater and dura mater, form the meninges, a very thick membrane that protects the brain and the spinal cord. The arachnoid mater is in the middle of the other two layers and it is very important since it holds the cerebrospinal fluid (CSF) in its interior. Arachnoid mater has finger-like projections that enter the dural venous sinuses and are called arachnoid villi. These villi are responsible for the diffusion of CSF into the blood.
The type of bond that forms to join monomers (such as sugars and amino acids) into polymers (such as starch and proteins) is a(n) __________ bond.
Answer:
Covalent
Explanation:
Covalent bonds are the ones that are formed by the sharing of electrons between the bonded atoms. Polysaccharides are the carbohydrates that have simple sugars bonded together by covalent bonds. Glycosidic linkage joins glucose residues of the starch together. Similarly, peptide bonds join the amino acids together to form proteins. Glycosidic bonds and peptide bonds are formed by sharing of electrons and are covalent bonds.
Monomers such as sugars and amino acids form polymers such as starch and proteins through covalent bonds. In specific terms, sugar monomers are joined via glycosidic bonds and amino acids are joined by peptide bonds - both are types of covalent bonds.
Explanation:The type of bond that forms to join monomers (such as sugars and amino acids) into polymers (such as starch and proteins) is a covalent bond
These covalent bonds form when two atoms share one or more pairs of electrons. In the case of forming complex carbohydrates like starch - mono-saccharides (sugar monomers) are joined together via glycosidic bonds - a type of covalent bond. Similarly, amino acids, the monomers of proteins, are joined by peptide bonds, which are also a specialized type of covalent bond.
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The cumulative biological war and tear that results from responses to stress that to maintain body equilibrium is known as:___________
Answer:
The cumulative biological war and tear that results from responses to stress that to main body equilibrium is known as Allostatic load
Explanation:
This condition results from excess cycle of response as they want to maintain allostasis when different environmental challenge takes place.In such cases, imbalance occur in those hormones( glucocorticoid, catecholamine,cytokines) which are responsible for stress.Chronic dysregulation causes cumulative physiological risk and causes disease by damaging the tissue and major organ system.
Which of these statements is correct?
A. Scientific ideas are subjected to repeated testing.
B. Science can be used to prove or disprove the idea that deities or spirits cause earthquakes and other natural disasters.
C. Science does not require observations that other people can confirm.
D. Only discovery science can lead to important conclusions about nature.
Final answer:
The correct statement is that scientific ideas are subjected to repeated testing (A). Science focuses on the natural world and relies on observations that other researchers can confirm. Discovery and hypothesis-driven scientific approaches are both valuable for making conclusions about nature.
Explanation:
The correct statement among the options provided is A. Scientific ideas are subjected to repeated testing. This is a fundamental aspect of the scientific method, which involves formulating hypotheses and then conducting experiments and making observations to test these hypotheses. The results are then analyzed, and conclusions are drawn, which may either support or refute the hypotheses. This process can lead to revisions or further testing, contributing to a more accurate understanding of the natural world.
With regards to a variation of a physiological value from its set point or normal limit, negative feedback always __________ the value back to the set point or normal limit.
A. returns
B. decreases
C. increases
D. There is not enough information to answer this question.
Answer:
Answer is A. returns.
Explanation:
Negative feedback is a situation where the result , outcome or end product of a system stabilize the input or stimulus of that same system.
Examples of negative feedback homeostasis and blood sugar regulation.
In blood sugar regulation, the glucagon tends to increase or raises the blood glucose when the level is low, while the insulin lower the blood glucose when the level is high.
Negative feedback mechanisms in physiological systems work to return a value back to its set point or normal limit by reversing changes, thereby maintaining stability in the system.
Explanation:In the context of physiological systems, the correct answer to the question would be 'A. returns'. Negative feedback mechanisms work to return a physiological value back to its set point or normal limit. This is because negative feedback systems act to counteract changes and maintain balance in the system. For example, if the body temperature rises, mechanisms such as sweating are initiated to decrease the temperature back to its normal limit. Thus, negative feedback works to maintain stability in a system by reversing any deviations from the set point.
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Maria loves to dance. She has noticed that whenever she dances, she has more energy the next day. Maria has noticed a __________ correlation.
Answer:
Maria noticed a positive correlation
Explanation:
Correlation is used to measure the extend to which two or more variables are related.
It can be positive where one variable increases when the other increases.
Negative where the increase of one aspect decrease the other variable.
Lastly, no correlation means there is no relationship between the two variables hence a change in one will not affect the other.
In the case of maria, there is a positive correlation between having more energy the next day and her dancing.
After crossing true-breeding yellow and green pea plants, Mendel allowed the yellow F1 plants to self. As a result of this F1 self-cross, he observed 5920 yellow peas and 2103 green pea plants. Determine whether or not these data are consistent with his law of equal segregation.
Answer:
The data are not consistent with law of equal segregation.
Explanation:
According to law of segregation, the ratio of yellow peas to green peas at F2 should be 3:1.
yellow green
Observed frequencies 5920 2103
Expected frequency [tex]\frac{3}{4}*8023[/tex] = 6017.25 [tex]\frac{1}{4} * 8023[/tex] = 2005.75
Using Chi square([tex]X^2[/tex]):
[tex]X^2[/tex] yellow = [tex]\frac{(observed frequency - expected frequency)^2}{expected frequency}[/tex]
= [tex]\frac{(5920 - 6017.25)^2}{6017.25}[/tex]
= 1.57
[tex]X^2[/tex] green = [tex]\frac{(2103 - 2005.75 )^2}{2005.75 }[/tex]
= 4.72
[tex]X^2[/tex] total = 1.57 + 4.72 = 6.29
Degree of freedom = 2 - 1 = 1
[tex]X^2[/tex] tabulated (α = 0.05) = 3.841
The calculated Chi square value is more than the tabulated Chi square value, hence, the conclusion is that the data are not consistent with law of segregation.
Repeated use of a drug or alcohol to the point of periodic or chronic intoxication that is detrimental to the user or society is called ________.
Answer: Drug abuse
Explanation:
Repeated use of a drug or alcohol to the point of periodic or chronic intoxication that is detrimental to the user or society is called drug abuse or substance abuse.
Substance abuse or drug misuse, is use of a drug or substances in overdose amounts that for the purpose of intoxication or mood alteration. Most drugs abused have properties that are sedative, stimulants among many other properties.
Drug misuse have detrimental and adverse effects on both the individual and the society at large
Cytoplasm A) A process in which electrons are transferred from one compound to another with a release of energy occurring in the production of ATP A Electron transport chain B) An organic molecule that occurs as an intermediate in many metabolic processes C Fermentation C) The chemical breakdown of a substance B Pyruvate D) The gel-like material within a living cell
Answer:
D) The gel-like material within a living cell
Answer:D) The gel-like material within a living cell
Explanation: Cytoplasm are materials within the cell erxcept the nucleus. Its a gel like material and also known as cytosol. It is made up of water,enzymes,salt etc.
The protein building instructions must be sent out to the cytoplasm. A copy of the instructions is made in the form of ________. This process is called ______________________.
Answer:
1. RNA
2. Transcription
Explanation:
DNA stores the instructions required for the synthesis of proteins. However, the sequence of DNA does not directly serve as a template for protein synthesis. Rather, the template DNA strand is copied into the RNA. The process is called transcription.
The RNA in eukaryotes undergo modifications such as removal of introns and the addition of specific sequences at its 3' and 5' end. This mature mRNA that joins ribosomes for protein synthesis. The nucleotide sequence of mRNA is read in the form of triplets and each triplet code for a specific amino acid.
The practitioner carefully monitors his client who exhibits hemoglobin S (HbS) genes. The practitioner know that the client is predisposed to life-threatening infection due to damage by HbS to which of the following organs?
-Spleen
-Lungs
-Heart
-Pancreas
Answer:
Answer is spleen.
Explanation:
Spleen is an organ in the body, and responsible for various actions like blood purification, removal of damaged blood cells and production of white blood cell.
Splenic sequestation is a situation where the spleen becomes enlarged. And this is common to sickle cell anemia people, especially the children. That is , the shape of the red blood cells are sickle.
In this case , the spleen becomes bigger , and the amount of oxygenated blood cells in the body are reduced.
if you selected the correct answer above, this means that you realized that natural selection is at play here. identify the four postulates
Answer:
Explanation:
•Variation: Organism shows variation within a population, these variation could be body size, facial marks, hair color, number of offspring, etc. Also some features shows little or no variation, for example the number of eyes a vertebrate have, etc
•Inheritance: Certain traits are always passed from parents to their offsprings, these traits are called HERITABLE TRAITS. But traits that are exhibited as a result of an environment are termed weak heritable traits.
•High rate of population growth: When the number of offsprings produced in a year is greater than the resources within an environment, such population will experience high rate of mortality.
•Differential Survival and reproduction: The ability possessed by an individual to struggle for survival within it's environment will give rise to more offspring in the next generation.
The DNA content of a diploid cell in the G1 phase of the cell cycle is measured. If the DNA content is x, then the DNA content at metaphase of meiosis II would be:
Answer:
2x
Explanation:
The G1 phase is a part of the interphase stage of the cell cycle, where the cell undergoes resting and preparation prior to division. Before division can occur, the cell needs to replicate its genetic material (DNA). The cell does this at the S-PHASE, after the First Gap or G1 phase.
The cell duplicates its DNA in order to ensure that each daughter cell receives equal and correct number of chromosomes (DNA). Hence, if the measured DNA at G1 phase was (x), it replicates/doubles I.e x+x or x × 2 = 2x.
Therefore, at the Metaphase phase (division), the DNA content will be 2x before they separate in the anaphase stage.
If the DNA content of a diploid cell is x in the G1 phase, by metaphase of meiosis II the DNA content would be x/2, since meiosis reduces the chromosome number by half to the haploid state.
The question posed relates to the changes in DNA content throughout the cell cycle, particularly from the G1 phase of interphase to metaphase of meiosis II. In the G1 phase, a diploid cell has a DNA content represented by x or 2c, which stands for two sets of chromosomes (2n). When a cell undergoes meiosis, it starts with a doubled DNA content (4c after S phase), but through meiosis I and meiosis II, the DNA content and number of chromosomes are halved. By metaphase of meiosis II, the cell has completed meiosis I and has halved its chromosome number already to 2c (1n, where n represents the number of complete sets of chromosomes).
Therefore, if the DNA content is x (2c) in the G1 phase, at metaphase of meiosis II, the DNA content would be x/2 (the haploid content or 1c), since meiosis reduces the chromosome number by half.
_________ is the preferred term to use when referring to the direction of a person’s sexual or romantic attraction.
Answer:
Sexual orientation
Explanation:
The sexual orientation is a term that defines the enduring pattern of sexual or romantic attraction of a person towards the opposite sex , same sex, more than one gender or towards both the sex. These are categorized as heterosexuality, homosexuality, bisexuality. The another category includes asexuality that includes lack or no sexual attraction.
The gender and gender identity is different from the sexual orientation. The combination of certain factors like environment, hormones, biological and emotional are responsible for sexual orientation. Most of the individuals are aware about their sexual orientation during adolescence.
Summarize the aerobic phases of cellular respiration?
Answer:
1. Kreb's cycle breakdown the acetyl CoA into CO2 and H2O. The energy released is stored in the reducing powers (NADH and FADH2).
2. The electron transport chain oxidized the reducing powers into their oxidized forms. During this electron transport, the proton concentration gradient is produced across the inner mitochondrial membrane that drives ATP synthesis.
Explanation:
Kreb's cycle and electron transport chain (ETC) are the aerobic phases of cellular respiration. The carbon skeleton glucose enters Kreb's cycle in the form of acetyl CoA and is completely oxidized into CO2 and H2O. For one molecule of glucose, Kreb's cycle produces four molecules of CO2, 6 NADH, and 2 FADH2. In addition, two ATP are also formed by substrate-level phosphorylation.
The NADH and FADH2 enter ETC and are oxidized by giving their electrons to the molecular oxygen. Here, some of the energy of electrons is used to pump the protons from the matrix to intermembrane space. The resultant proton concentration gradient drives ATP synthesis. NADH produces the proton gradient enough to drive around 3 ATPs while FADH2 supports the formation of around 2 ATPs by oxidative phosphorylation.
The study of biological processes by comparing different species is known as
a. the comparative approach.
b. translational approach.
c. Gorzalka approach.
d. between-subjects approach.
Answer:
The correct answer is a. the comparative approach.
Explanation:
In the comparative method, we do the comparison between two different values, groups, cultures, etc. In a comparative approach, the similarities and differences are checked between two things to draw a conclusion.
Comparative study helps in finding out the relationship between two subjects. It can be used for hypothesis testing and theory building. Comparative study is and can be used in every field. So the study of biological processes by comparing different species is known as comparative study.
Skin color is controlled by three pairs of alleles. Someone with very light skin has 6 recessive alleles while someone with very dark skin has 6 dominant alleles. A person who has a skin color midway between lightest and darkest ________.
Answer:
Has three dominant alleles
Explanation:
Skin colour is a polygenetic inheritance and it is controlled by three genes pairs of alleles. The human skin is determined by the amount of melanin it contains. A combination of melanin producing alleles determines the skin color.
In the above question, the person has a skin color that is midway meaning only half of the alleles produced melanin. The total number of alleles is 6 and half of it is 3. So, only 3 alleles were dominant and the remaining three were recessive.
Answer:
The graph demonstrates the quantitative variation for skin pigmentation.
A bar graph has skin pigmentation color on the horizontal axis and Proportion of population on the vertical axis. From lightest to darkest skin colors, the proportions are: 1/64, 6/64, 15/64, 20/64, 15/64, 6/64, 1/64.
Which conclusion is supported by the graph?
More than half of the population has the central skin pigmentation.
The lightest and the darkest skin pigmentations are equally common in the population. **
The central skin pigmentation makes up more of the population than the rest of the skin pigmentation groups combined.
Fewer people have skin pigmentation lighter than the central peak than people who have pigmentation darker than the central peak.
Explanation:
Title II of the Sarbanes-Oxley Act prohibits registered public accounting firms from providing certain nonaudit services. These services include all of the following except:
Answer:
A.
tax preparation services.
Assuming chimps and gorillas are humans' closest relatives, removing humans from the great ape clade and placing them in a different clade has the effect of making the phylogenetic tree of the great apes _______.
A) polyphyletic
B) into a new order
C) monophyletic
D) paraphyletic
Answer:
c
Explanation:
Which of the following describes osmosis?
a. Oxygen transfers into red blood cells through small gaps in the cell membrane from the oxygen- rich environment surrounding the cells
b. Large molecules are brought into the cell by wrapping the cell membrane around the molecules to form a vacuole.
c. Water moves across the cell membrane from the side with high osmotic pressure towards the side with low osmotic pressure.
d. Membrane proteins provide a pathway for larger particles to move across the cell membrane and bring the cell and environment closer to equilibrium.
Answer:
The correct option is C.
Explanation:
Osmosis is a good example of passive transport. In this transport across the cell membrane without any input of cellular energy movement of atomic substance occurs.
Osmosis is defined as the movement of water across the selectively permeable cell membrane from the high osmotic pressure potential towards the area of low osmotic pressure potential. Some examples of osmosis are skin soaking up water, plants receiving water, and when exposed to freshwater red blood cells swelling up.
Osmosis, described in option 'c', is the movement of water from a high to a low concentration through a semi-permeable cell membrane. It aims at achieving a equilibrium state, and is present in various biological processes like water absorption in plant cells.
Explanation:The process that best describes osmosis is option 'c'. Osmosis is the movement of water across a semi-permeable cell membrane from an area of high water concentration (or high osmotic pressure) to an area of low water concentration (or low osmotic pressure). This natural process aims to achieve a state of equilibrium, where the water concentration is the same on both sides of the membrane.
To provide an example, plant cells use osmosis to absorb water from the soil. Inside the cell is a solution with various solutes. Compared to the surrounding soil, this solution has lower water concentration or higher osmotic pressure. Therefore, water from the soil enters the plant cell via osmosis, moving from an area of high water concentration to low water concentration.
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Which term best describes coal, water, and wood?
A
man-made resources
B
renewable resources
C
non-renewable resources
D
natural resources
Coal, water, and wood are best described as natural resources. Coal is non-renewable, whereas water and wood can be renewable if properly managed, making 'natural resources' the umbrella term that accurately categorizes all three.
The question asks which term best describes coal, water, and wood. The best answer is D, natural resources. Natural resources are materials or substances that occur in the natural environment and can be used for economic gain. They are divided into two main categories: renewable and non-renewable resources. Coal is a non-renewable resource, as it does not regenerate at a rate that can sustain its consumption. Water and wood, however, can be considered renewable resources if managed properly; water cycles through the environment, and forests can be replanted and replenished. Therefore, the inclusion of both renewable and non-renewable items in the list points to the broader category of natural resources as the correct answer.
D) Natural resources - Coal, water, and wood are naturally occurring substances essential for various human activities and ecosystem functioning.
Coal, water, and wood are all examples of natural resources. Natural resources are materials or substances that occur naturally in the environment and are used by humans for various purposes. Coal is a fossil fuel formed from the remains of plants that lived millions of years ago.
Water is a vital resource that occurs naturally in lakes, rivers, oceans, and groundwater, and is essential for life and various human activities. Wood comes from trees and is used for construction, fuel, and various other purposes.
These resources are considered natural because they are not created by human intervention but rather exist naturally in the environment. While some natural resources, like wood, can be renewable if managed sustainably, others, like coal, are non-renewable and finite in supply.
However, all of these resources are fundamentally derived from natural processes and are essential for supporting human civilization and the functioning of ecosystems.
The correct option is D) natural resources.
A 60-year-old man complains of chest pain. He is conscious and alert and denies shortness of breath. Which of the following questions would be the MOST appropriate to ask him?
Answer: "Do you have any heart problems or take any medications?"
Explanation:
The most suitable question to ask a 60-year-old man with chest pain is whether he was exerting himself when the pain began, as this helps discern if the pain is angina related to physical activity, a common symptom of coronary heart disease. Option A is correct.
When assessing a 60-year-old man complaining of chest pain who is conscious, alert, and denies shortness of breath, the most appropriate question to ask would be "Were you exerting yourself when the chest pain began?" This question helps determine if the chest pain, described as angina, is related to physical activity, which is a typical characteristic of ischemic chest pain due to coronary artery disease.
It's essential to identify if the pain is stable angina, which usually occurs with exertion and is relieved by rest, or whether it indicates a more emergent condition such as an acute myocardial infarction. Additional critical questions would involve inquiring about pain radiation to the arms, as angina pain can often spread to the arms, neck, jaw, back, or feel like indigestion. Given that any chest pain could potentially be a sign of a serious condition, thorough and immediate assessment by a medical professional is crucial.
Hence, A. is the correct option.
The complete question is:
A 60-year-old man complains of chest pain. He is conscious and alert and denies shortness of breath. Which of the following questions would be the MOST appropriate to ask him?
Select one:
A "Were you exerting yourself when the chest pain began?"
B "Do you have any heart problems or take any medications?"
C "Does the pain in your chest feel like a stabbing sensation?"
D "Does the pain in your chest move to either of your arms?"
When a line cook in a restaurant cooks uses raw meat to cook a hamburger that becomes part of the restaurant's Super Burger Special (available only on Saturday nights during football season), the cook is taking part in a
A) transformation process.
B) turning point.
C) conversion process.
D) therblig.
E) metamorphosis.
A
Answer:
The answer is A) transformation process
Explanation:
Transformation Process:
In management, a transformation process is any measure that takes a particular input, transforms it and adds value to it for clients and customers. Transformation processes can be applied to all, commodities, customers and information.
In this particular case, the chef has taken a raw material i.e. the meat, transformed it into a hamburger and added value to it by adding the bun, vegetables, cheese etc.
About 12 to 24 hours after the last meal, a person's blood sugar level normally varies from 60 to 90 mg per 100 ml of blood, although it may rise to 130 mg per 100 ml after meals high in carbohydrates. That the blood sugar level is maintained within a fairly narrow range, despite uneven intake of sugar, is due to the bodily process called_______________.
The process that helps to maintain the blood sugar level within a fairly narrow range is ; Homeostasis
The insulin and glucagon hormones help in the maintenance of the sugar levels in the human body( Homeostasis ).The function of glucagon is to increase the blood sugar levels, while the insulin decreases high level of blood sugar levels.
Homeostasis is the process of maintaining stable living conditions of an organism by the organism in response to both internal and external changes. As seen in the question the blood sugar level is maintained within a fairly narrow range by both Insulin and glucagon hormones.
Hence we can conclude that The process that helps to maintain the blood sugar level within a fairly narrow range is ; Homeostasis .
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The process maintaining blood sugar level within a narrow range is homeostasis. It's primarily controlled by insulin, which reduces blood glucose by promoting its utilization, and glucagon, which increases blood glucose by stimulating glycogen breakdown during fasting or the postabsorptive state.
Explanation:The bodily process that maintains blood sugar level within a fairly narrow range, despite uneven intake of sugar, is called homeostasis. This process is primarily controlled by two hormones, insulin and glucagon. Blood glucose levels tend to rise after a meal, and especially high-carbohydrate meals which would trigger the release of insulin from the beta cells of the pancreas. Insulin facilitates the uptake of glucose by the body cells and its utilization for energy production, thereby lowering blood glucose level.
On the other hand, during periods of fasting or the postabsorptive state, when glucose levels drop, glucagon is released from the alpha cells of the pancreas. Glucagon stimulates the breakdown of stored glycogen in the liver into glucose and its release into the blood, thus increasing blood glucose level. This process of regulation ensures that blood glucose is maintained within the optimal range for the body's function.
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This human karyotype is unusual because chromosome set
a. 5 has chromosomes of different shapes
b. 10 is missing genetic material
c. 14 has enlarged centromeres
d. 21 has an extra chromosome
Answer:
The correct option is d) 21 has an extra chromosome
Explanation:
The complete array of chromosomes that an individual possesses is known as the karyotype of the individual. Humans have 46 chromosomes which make up 23 pairs.
In the karyotype shown in the picture, the 21st pair has an extra chromosome. Such a condition is known as Down's Syndrome. In such a person, the mental ability of the person is influenced and he usually suffers from mental disabilities. The facial features of such a person also are different.
This human karyotype is unusual because chromosome set 21 has an extra chromosome (option d).
A karyotype is a graphic representation of the individual's collection of chromosomes.In diploid organisms (e.g., humans), each cell receives two homo-logous chromosomes, one from each parent.Human somatic (body) cells contain 46 chromosomes, which are organized into two sets of 22 homo-logous chromosomes and two sex chromosomes (either XX or XY).In conclusion, this human karyotype is unusual because chromosome set 21 has an extra chromosome (option d).
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A test was given to a group of students. The grades and gender are summarized below A B C Total Male 5 18 8 31 Female 9 7 16 32 Total 14 25 24 63 If one student is chosen at random from those who took the test, Find the probability that the student got a 'C' GIVEN they are male.
Answer:
Pr. (male) = 0.49
Explanation:
A B C TOTAL
male 5 18 8 31
female 9 7 16 32
TOTAL 14 25 24 63
Now to find the probability that the student got a 'C' given they are male, we need to know the total numbers of males(i.e no of required outcomes) which = 31
also the total number of the group of students(i.e total no of possible outcomes) = 63
∴ Since Probability = [tex]\frac{no of required outcomes}{total no of possible outcomes}[/tex]
we have Pr (male) = [tex]\frac{31}{63}[/tex]
=0.49
A football quarterback can simultaneously make calculations of receiver distances, player movements, and gravitational forces. This best illustrates the activity of multiple ________.a. endocrine glandsb. endorphin agonists
c. neural networks
d. endorphin antagonists
e. thresholds
Answer: Neural networks
Explanation:
The brain woks by combination of the networks. There are different types of neurons that combines together to function.
The network of neurons that are combined together in such a way to process the data.
It has the ability to process data in such a way that multiple function can be performed together like decision making, receiver distance, et cetera.
As a part of his workout regimen, a 21-year-old college football player often engages in squats and lateral arm holds. These are examples of what type of exercise?
a) aerobicb) isotonicc) anaerobicd) isometric
Answer:
The correct answer is- isometric exercise
Explanation:
Isometric exercise also called static strength training which requires contraction of a particular muscle group. In isometric exercise, the joints do not move and the length of the muscle does not change noticeably.
Squat and lateral arm hold are the example of isometric exercise. Isometric exercise improves the strength of a particular muscle or group muscle for example squat helps in building leg muscles.
Therefore if a girl is engaged in squats and lateral arm holds then it is an example of isometric exercise.
Final answer:
The college football player's workout regimen, including squats and lateral arm holds, consists of c) anaerobic and d) isometric exercises designed to increase muscle strength, mass, and endurance, without a significant change in muscle length during the isometric holds.
Explanation:
The college football player engaging in squats and lateral arm holds is primarily performing anaerobic and isometric exercises. Squats entail lifting and lowering the body's weight, which is a form of anaerobic exercise that includes periods of physical exertion and high-intensity, strength-training activities. Meanwhile, lateral arm holds involve maintaining an arm position against resistance without movement, which is an isometric exercise where the muscle tension remains constant despite no change in muscle length.
Which of the following hormones is released by the anterior pituitary as a part of that positive feedback loop between it and the ovary?
The anterior pituitary releases LH and FSH as part of the positive feedback loop with the ovary, triggered by high levels of estrogen leading to ovulation.
Explanation:The hormone released by the anterior pituitary as a part of the positive feedback loop between it and the ovary is LH (Luteinizing Hormone) and FSH (Follicle Stimulating Hormone). This occurs when the dominant follicle in the ovary secretes a large amount of estrogen, which in normal cases would exert a negative feedback. However, when estrogen levels are extremely high, they instead trigger a positive feedback loop, causing the anterior pituitary to release significant amounts of LH and FSH into the bloodstream. This event predominantly happens during the ovulation phase of the menstrual cycle, signaling one of the key steps that lead to ovulation.
Luteinizing hormone (LH) is released by the anterior pituitary in the positive feedback loop between it and the ovary.
Let's break down the options:
A) Progesterone: Progesterone is not released by the anterior pituitary; it is primarily produced by the corpus luteum in the ovary.
B) Luteinizing hormone (LH): LH is indeed released by the anterior pituitary and plays a crucial role in the positive feedback loop between the anterior pituitary and the ovary during the menstrual cycle.
C) Gonadotropin releasing hormone (GnRH): GnRH is released by the hypothalamus, not the anterior pituitary. It stimulates the release of LH and follicle-stimulating hormone (FSH) from the anterior pituitary.
D) Estrogen: Estrogen is primarily produced by the developing follicles in the ovary, not the anterior pituitary.
E) Gonadotropin: This term refers to hormones that stimulate the gonads (ovaries and testes), such as LH and FSH. "Gonadotropin" alone does not specify a particular hormone released by the anterior pituitary.
Therefore, the correct answer is: B) Luteinizing hormone
Luteinizing hormone (LH) is released by the anterior pituitary as part of the positive feedback loop between it and the ovary during the menstrual cycle.
The complete question is here:
Which of the following hormones is released by the anterior pituitary as a part of that positive feedback loop between it and the ovary?
A) Progesterone
B) Luteinizing hormone
C) Gonadotropin releasing hormone
D) Estrogen
E) Gonadotropin