Answer:
Basically exercise maintains the integrity of white matter which contains billions of neurons;
Therefore regular exercises reduces Alzheimer's diseases by 50 %. it stimulates the brain's ability to maintain old neuronal connections (synapses), and to make new ones.
Generally, exercise, increases cerebral blood flow, and therefore Oxygen supply to the brain.This stimulates neuronal metabolism.
Explanation:
Place the events in the correct sequence.Not all items will be used.
A) Neurotransmitter crosses synaptic cleft
B) Neurotransmitter attaches to receptors on a muscle, neuron, or gland cell
C) Calcium leaves the synaptic knob
D) Neurotransmitter enters synaptic knob by endocytosis
E) Voltage-gated calcium channels open
F) Calcium enters the synaptic knob
G) Synaptic vesicles merge with synaptic knob plasma membrane
H) Neurotransmitter is released by exocytosis
I) Action potential reaches synaptic knob
The sequence of events concerning neurotransmitters are, in order: Action potential reaches synaptic knob, Voltage-gated calcium channels open, Calcium enters the synaptic knob, Synaptic vesicles merge with synaptic knob plasma membrane, Neurotransmitter is released by exocytosis, Neurotransmitter crosses synaptic cleft, and Neurotransmitter attaches to receptors on a muscle, neuron, or gland cell.
Explanation:The correct sequence of these events, involving neurotransmitters and the synaptic knob, would be as follows:
I) Action potential reaches synaptic knobE) Voltage-gated calcium channels openF) Calcium enters the synaptic knobG) Synaptic vesicles merge with synaptic knob plasma membraneH) Neurotransmitter is released by exocytosisA) Neurotransmitter crosses synaptic cleftB) Neurotransmitter attaches to receptors on a muscle, neuron, or gland cellThe sequence begins with the action potential reaching the synaptic knob, after which voltage-gated calcium channels open. This causes calcium to enter the knob, and synaptic vesicles to merge with the plasma membrane. The neurotransmitter is then released by exocytosis, crosses the synaptic cleft, and finally attaches to receptors on a neuron, muscle, or gland cell.
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The sequence will be:
I) Action potential reach synaptic knob
E) Voltage gated channels open
F) Calcium enters synaptic knob
G) Vesicles merge with plasma membrane
H) Neurotransmitter releases via exocytosis
A) Neurotransmitter cross synaptic cleft
B) Neurotransmitter attaches to receptors on muscle/neuron/gland
The following sequence describes the events leading to neurotransmitter release and binding in a synapse:
The action potential first reaches the synaptic knob where the voltage gated calcium channels open and causes calcium influx into the synaptic knob. Due to the calcium, the vesicles containing neurotransmitter merges with the plasma membrane causing the release of the neurotransmitter by exocytosis. The neurotransmitter travels the synapse and then bind with the receptor on the post-synaptic neuron/ muscle/ gland.
Thus, the sequence will be:
I) Action potential reach synaptic knob
E) Voltage gated channels open
F) Calcium enters synaptic knob
G) Vesicles merge with plasma membrane
H) Neurotransmitter releases via exocytosis
A) Neurotransmitter cross synaptic cleft
B) Neurotransmitter attaches to receptors on muscle/neuron/gland.
use diagram, answer questions
Answer:cell 9 is not missing any organelles compared to cell 1.
Cell 2 would not function normally because it lacks the mitochondria which is the powerhouse necessary for energy production & hence growth & survival.
Cells 4 & 7 lack the rough endoplasmic reticulum responsible for protein formation hence amino acids which are the building blocks of life will not be produced.
Explanation:
A person you know has been in an automobile accident. After the accident, you notice a dramatic personality change. Before the accident, he was industrious and well liked; after the accident, he is profane, impetuous, and incapable of working toward a goal. Which portion of the brain was most likely damaged?
Answer:
FRONTAL LOBE
Explanation:
The frontal lobe can be located at the anterior part of the brain, extending back to a fissure known as the central sulcus. The frontal lobe functions and helps in coordination of reasoning, motor control, emotion, and language. It contains the motor cortex, which is involved in planning and coordinating movement; the prefrontal cortex, which is responsible for higher-level cognitive functioning; and Broca’s area, which is essential for language production.
Let say for example Kyle is my friend who was a victim of an accident.
Before the accident, he was industrious and well liked BUT after the accident, he is profane, impetuous, and incapable of working toward a goal.
Such changes in personality would be consistent with loss of impulse control which is a significant frontal lobe function. With connections between the planning functions of the frontal lobe and the emotional processes of the limbic system severed, Kyle had difficulty controlling his emotional impulses, attitudes and abiiity of working towards his goals.
In which of the following scenarios would energy be mostly derived from anaerobic metabolism?A. When an athlete is in a steady state or at restB. When an athlete begins an activityC. When an athlete experiences temporary fatigueD. When an athlete reduces the duration of an activity
Answer:
Option C
Explanation:
The situation of fatigue occurs in an athlete when he/she is doing rigorous exercise or an activity requiring intense muscular activity. In these scenarios, muscles cells undergo anaerobic respiration which eventually leads to acidification and hence fatigue in muscles. Also during this scenario, the resting membrane potential of the muscles depolarizes and muscle may deplete in severe cases. Thus, during temporary fatigue muscle experiences highest level of anaerobic respiration.
Option C is correct
Imagine this scenario in the not too distant future. You know your own genome, and it reveals that you have a genetic recessive gene for a deadly genetic disease (you are a 'carrier' but do not have the disease) and your spouse has the same knowledge with the same diagnosis. It might be possible based on what biotechnology approach to correct the problem caused by the disease?
Gene therapy coupled with cloning technology can be performed to correct the problem caused by the disease.
Explanation:
The gene therapy is performed to treat or prevent disease using the genes. Generally drugs are surgery is preferred to treat the disease, but in this case the genes are inserted into the patient’s cell for the treatment.
This therapy treats and cures the deadly genetic disease. The genomes can be cloned to treat the deadly genetic disease effectively.
A virus which incorporates its DNA into the DNA of its host organism is existing as a _____.
Answer:
The virus is existing as a prophage.
Explanation:
The prophage is formed when there is formation of plasmid or insertion of chromosome. This prophage is linked with lysogenic conversion.
Note that, when an organism is able to survive in their host through the integration of their DNA to the chromosome of the host is known as the lysogenic conversion.
Mark knows that animals reflexively blink when air is puffed at their eyes. Now Mark wants to use this fact and classical conditioning to train a rat to blink when it hears a tone. He has just started presenting the tone to the rat. Which step of classical conditioning is this?
Answer:
Step 2 - presentation of the neutral stimulus.
Explanation:
Classical conditioning is the learning procedure in which the active stimulus when mixed with neutral stimulus elicit a strong response. This conditioning was explained by Pavlov.
In the given situation, the tone acts as the neutral stimulus. This stimulus will combine with the puffing that acts as the other strong stimulus and result in the blinking of the animals. Here, Mark shows the step 2 of the classical conditioning.
Thus, the answer is step 2 - presentation of the neutral stimulus.
All organisms fit into one of the two following categories.
Select one:
a. consumers and decomposers
b. scavengers and detritivores
c. producers and consumers
d. none of these
Answer:
C, as in Cat.
All organisms fit into one of the two following categories that is option C. producers and consumers.
In any ecosystem, all organisms are classified or categorized in different tropical levels based on their feeding behavior. We can divide any organism into two major groups on their feeding behaviors:
Producers: these are organism that are autotrophs which mean they are able to make their own food for energy and nutrition. For instance, plants produce their own food through photosynthesis.Consumers: These are organisms that are heterotrophs, depend on producers or other organisms for their food and nutrition. Scavengers, animals, are examples of such organisms.On the basis of the given explanation, we can say that all organisms fit into one of the two following categories C. producers and consumers.
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The fossil evidence found in these sedimentary layers BEST implies that A) invertebrates evolved into vertebrates. B) animals evolved bony skeletons after shells. C) plants and animals with bones evolved together. D) land animals and marine animals evolved together.
The diagram is missing in the question. It can be found in the following link: https://quizizz.com › admin › quiz › 566b055c5cbcd49e2dd0fed1 › earth.
The fossil evidence found in these sedimentary layers best implies that animals evolved bony skeletons after shells
Explanation:
Fossil is not only describing when organism lived, but it also gives information about the “progression and evolution of life” on this earth over millions of years. Fossils also give information that previous life in earth is different from present life.
According to evolutionist around 500 million years ago complex internal skeleton organism came into existence. They told fish had firstly evolved and they dominated the sea. Fossilization is very rare process.
Explanation:
answer is b hope it helped <3
British investigators conducted a study to examine measles- mumps-rubella (MMR) vaccine history among 1,294 children with pervasive development disorder (e.g., autism and Asperger's syndrome) and 4,469 children without such disorders. (They found no association.) This is an example of which type(s) of study?
A. Randomize Control Trial
B. Case-Control
C. Cross-sectional
D. Retrospective Cohort
Answer:
B. Case-Control
Explanation:
A case-control is a study that compares a group with an outcome of interest (cases) with a group who do not have the outcome (controls). This study aims to looks back retrospectively to compare how frequently the exposure to a risk factor is present in each group and with that to determine the relationship between that risk factor and the outcome.
So in this case, the cases are children with pervasive development disorder and the control is those without the disorders.
These studies are normally observational because no intervention is attempted.
The energy required for the mechanism of "active transport" comes from: 1.the reactants which yield ATP 2. the product of ATP decomposition 3. photosynthesis 4. cytokinesis
Answer: 2. the product of ATP decomposition
Explanation:
The Adenosine triphospahte ATP is an energy currency made up,of 3 phospahte ions bonded to adenosine molecule
Each of these inorganic ions is bonded to Adenosine molecule by certain bond energy.Therefore the hydrolysis of these phosphate ions release equal amount of ENERGY of value
ATP HYDROLYSIS ADP + P(ions)
(30,5kj/mol) of energy for the first 2 inorganic phosphate hydrolysed, and 14.2kjmol for the last inorganic phosphate.
The formation and action of angiotensin II can be summarized as follows: It is synthesized either when blood pressure is ____________ or the ____________ division is activated. It causes a(n) ____________ in resistance, ____________ in fluid output (which helps to maintain blood volume and blood pressure), and an increase in blood ____________ (if fluid intake occurs). Consequently, blood ____________ increases. This is aided by the release of both ____________ and aldosterone. As blood pressure returns to within normal homeostatic levels, both renin release and angiotensin II synthesis are decreased by ____________ feedback.
Angiotensin II conflation is touched off by low blood pressure or sympathetic activation, leading to increased blood resistance, dropped fluid affair, and, if fluid input occurs, increased blood volume and pressure. This process is supported by the release of ADH and aldosterone and is regulated by negative feedback.
The conformation and action of angiotensin II can be epitomized as follows It's synthesized either when blood pressure is low or the sympathetic division is actuated. It causes a( n) increase in resistance, drop in fluid affair( which helps to maintain blood volume and blood pressure), and an increase in blood volume( if fluid input occurs). Accordingly, blood pressure increases. This is backed by the release of bothanti-diuretic hormone( ADH) and aldosterone. As blood pressure returns to within normal homeostatic situations, both renin release and angiotensin II conflation are dropped by negative feedback.
Standard Precautions: Bloodborne Pathogens and Other Potentially Infectious Materials (PA) - KnowledgeQ
Answer:
These are the following precautions that must be taken during the blood borne Pathogens and Other Potentially Infectious Materials:
The area that are exposed with the pathogens must be washed with the water and soap. The exposure source must be notified to the lab assistant or supervisor.The unprotected sex must be avoided to prevent the transmission of the pathogen from mother to the fetus.The finger or the area must be rubbed with the alcohol and must be involved in the daily routine of the hand hygiene.The individual should not eat or apply anything on the wounded area exposed with the pathogens.Some blood borne pathogens are hepatitis B virus, bacteria and some pathogens as well.The correct answer is option (b) Out of the listed practices, the most essential for minimizing exposure to bloodborne pathogens and OPIM is Wearing personal protective equipment (PPE) such as gloves, gowns, masks, and eye protection.
Personal protective equipment (PPE) creates a physical barrier between the healthcare worker and potentially infectious materials. Gloves, gowns, masks, and eye protection all play a crucial role in preventing contact with blood, bodily fluids, and other potentially infectious materials.
Reusing gloves after disinfection (a) is not recommended. Disinfection might not be effective in eliminating all pathogens, and reused gloves could become contaminated.
Disposing of sharp objects in regular trash bins (c) is a safety hazard. Sharps containers are specifically designed to safely collect and dispose of sharp objects to prevent accidental needle sticks and injuries.
Eating and drinking in areas where OPIM are handled (d) is a hygiene concern. These areas could be contaminated, and ingesting contaminated materials increases the risk of infection.
Therefore, wearing appropriate PPE is the most important practice to minimize exposure to bloodborne pathogens and OPIM in a healthcare setting.
The complete question is:
Which of the following practices is essential for minimizing the risk of exposure to bloodborne pathogens and other potentially infectious materials (OPIM) in a healthcare setting?
a) Reusing gloves after proper disinfection
b) Wearing personal protective equipment (PPE) such as gloves, gowns, masks, and eye protection
c) Disposing of sharp objects in regular trash bins
d) Eating and drinking in areas where OPIM are handled
Chloroplasts collect sunlight in order to power photosynthesis. In a typical plant, which type of cell would you expect to have more chloroplasts?
Answer:
The correct answer is - palisade cells that are type leaf cells.
Explanation:
The outer layer of cells does not contain chloroplast that is a protective layer called the epidermis. The palisade layer is immediate to the top layer of the leaf that contains most of the chloroplast in comparison to the other parts of the roots or leaf cells.
Chloroplast contains chlorophyll that collects sunlight in order to initiate photosynthesis. There are different types of chlorophyll types present in the cell of the plant.
Thus, the correct answer is - palisade cells that are type leaf cells.
Which of the following is a major cause of the size limits for certain types of cells?
A. the difference in plasma membranes between prokaryotes and eukaryotes
B. the evolution of larger cells after the evolution of smaller cells
C. the observation that longer cells usually have greater cell volume
D. the need for a surface area of sufficient area to allow the cell's function
E. the evolution of eukaryotes after the evolution of prokaryotes
Answer:
D. the need for a surface area of sufficient area to allow the cell's function
Explanation:
Many cellular functions such as the exchange of substances and respiratory gases, absorption of nutrients, cell-cell communication, etc. require the cells to have a sufficient surface area. A small cell has a larger surface area to volume ratio and therefore, maintains a higher rate of exchange of substances. As the cell increases in size, the surface area grows less than its volume. Therefore, the surface area required to perform the cellular functions puts an upper limit on the cell size.
Cells maintain the required surface area by dividing and/or by developing folding or projections on the surface. For instance, the cells in the wall of the small intestine require to maintain a higher surface area for nutrient absorption. Therefore, the cells of the wall of the small intestine develop microvilli to have a larger surface area which in turn supports a relatively higher rate of absorption.
What health problems contraindicate the use of fibrates for the treatment of dyslipidemia? Select all that apply.A.Niacin B. Prolin C.Diasin D.none of above
Answer:D
Explanation:None of The above
Which of the following is NOT true about the cohesion-tension model of water transport?Select one:a. Water must completely fill the pipeline.b. Water molecules attract one another.c. Transpiration exerts a tension as water evaporates from leaves.d. Water is transported in the phloem.e. Water must be attracted to the sides of the xylem.
Answer:
d. Water is transported in the phloem.
Explanation:
Xylem is the vascular tissue responsible for the movement of water and dissolved minerals from roots to various plant parts. Phloem is another vascular tissue that serves mainly in the translocation of sugars. The cohesion-tension model of water transport explains that the upward movement of water from roots to the aerial plant parts is drive by transpiration pull. Transpiration of water from leaves results in a large negative pressure in xylem elements. Cohesion and adhesion properties of water maintain the water column in xylem elements.
Which of the following best describes the biological role of the lac operon?
A. It ensures that a cell dedicates resources to the production of enzymes involved in lactose metabolism only when lactose is available in the environment.
B. It prevents other sugars from being metabolized until all available lactose has been used.
C. It ensures that a cell produces enzymes involved in lactose metabolism in a constitutive manner.
D. It ensures that bacterial cells produce lactose only when no other food sources are available.
Answer:
D. It ensures that bacterial cells produce lactose only when no other food sources are available.
Explanation:
E. coli uses three enzymes to produce lactose. The genes for these three enzymes are found in lac operon.
Algal cells are placed in an isotonic solution. Additional amounts of solutes are slowly added to the solution. What happens to the cells?A) They will begin to swell.
B) They will burst.
C) They will stay the same.
D) They will shrink.
Answer:
The correct answer will be option-D
Explanation:
An isotonic solution is a solution which contains iso or the same amount of solute concentration to the inside of the cell.
If the solute is added to the isotonic solution then the solute concentration of the solution will be increased and thus the solution will be called a hypertonic solution. The hypertonic solution has high osmotic pressure and low water concentration.
When algal cell will be placed in a hypertonic solution then the algal cell will shrink as the water will move out of the algal cell as a result of the osmosis- the movement of the water from high concentration to low concentration.
Thus, option-D is the correct answer.
Final answer:
Correct option is D. When additional solutes are added to an isotonic solution containing algal cells, the solution becomes hypertonic, and the cells will shrink due to water leaving them to balance solute concentrations.
Explanation:
When algal cells are placed in an isotonic solution and additional solutes are slowly added, the solution becomes hypertonic relative to the cells. As more solute is added to the solution, water begins to move out of the cells to balance the concentration of solutes outside the cell, because there is now a higher concentration of solutes outside than inside the cell. This process is known as osmosis. As the algal cells lose water, they will shrink, a process known as crenation in animal cells or plasmolysis in plant cells. Therefore, the correct option will be D) They will shrink.
Terrance, whose birth mother drank alcohol heavily throughout pregnancy, has a thin upper lip, short eyelid openings, a small head, and a smooth philtrum. His physical growth has been slow, and he shows impairments in memory, attention span, motor coordination, and social skills. Terrance has ________.
a. partial fetal alcohol syndrome
b. alcohol-related neurodevelopmental disorder
c. fetal alcohol syndrome
d. cytomegalovirus
Answer:
fetal alcohol syndrome
Explanation:
Fetal alcohol syndrome is a syndrome that is a group of different symptoms or conditions that appear in a person whose mother consumed alcohol during pregnancy. The different problems that a person may suffer from including small head size, short height, thin upper lip, smooth philtrum, etc. Besides this, the mental health of the person is also affected and thus, the person may have memory impairment, social anxiety, etc. Since it has been mentioned that Terrance's mother consumed alcohol throughout pregnancy and the symptoms that Terrance shows also are similar to that of a person suffering from Fetal alcohol syndrome, it can be concluded that he is suffering from this condition.Butterflies of the genus Colias live in the Rocky Mountains, where they experience a wide range of temperatures. Different variants of a particular glycolytic enzyme in the flight muscles are optimally active at different temperatures. Within the same population, some individual butterflies fly most effectively at 29°C , while others fly most effectively at 40°C. Still others can be equally active at both temperatures. Which of the following claims is most consistent with the observed butterfly behavior?
Butterflies that express two variants of the enzyme are active over a greater range of temperature.
Butterflies that are active over a wide range of temperatures produce greater amounts of the enzyme.
Temperature has little effect on the activity of butterflies.
Butterflies that are active at warmer temperatures produce more offspring.
Answer:
The correct option is A) Butterflies that express two variants of the enzyme are active over a greater range of temperature.
Explanation:
The butterflies which fly most effectively at 29 degrees Celsius produce one type of variant for the particular glycolytic enzyme in the flight muscles. Whereas the butterflies which fly at 40 degrees Celsius produce anther type of variant for the particular glycolytic enzyme in the flight muscles.
The butterflies which are effective at both temperatures i.e 29 degrees Celsius and 40 degrees Celsius can produce both forms of the variant for the particular glycolytic enzyme in the flight muscles.
Butterflies who inhabit a wide range of temperatures need to produce enzymes that improve their flight. The correct option is 1. Butterflies that express two variants of the enzyme are active over a greater range of temperature.
-----------------------
We know that different variants of the enzyme are optimally active at different temperatures. So there must be an enzymatic variant per temperature or temperature range.
Some individuals of the population live in areas where the temperature is 29ºC, so they produce one type of enzyme. These individuals can fly at 29ºC but not at 40ºC.
Some other individuals live under 40ºC temperature, synthesizing another variant of the enzyme. These individuals can fly at 40ºC but not at 29ºC.
Since this is the same population, there must be individuals who can fly at both temperatures. This is the third group of butterflies.
These individuals are equally active at both temperatures, meaning they can fly at 29º and 40ºC. So they need to have two variants of enzymes that make them good at flight. The one needed to fly at 29ºC, and the other enzyme needed at 40ºC.
1) Butterflies that express two variants of the enzyme are active over a greater range of temperature.
This is correct. These butterflies need both variants of the enzyme to fly at both temperatures, covering a wider range.
2) Butterflies that are active over a wide range of temperatures produce greater amounts of the enzyme.
This is not correct. Independently of the amount of enzyme, they need the two variants to express a good flight at both temperatures.
3) Temperature has little effect on the activity of butterflies.
This is not correct. Temperature influences the butterflies. This is a limiting factor for individuals.
4) Butterflies that are active at warmer temperatures produce more offspring.
This is not correct. According to this information, we can not know which butterfly produce more offspring.
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Interdisciplinary research will characterize the work of physical education teachers because the problems and issues investigated can be more effectively solved and funding is more readily available through collaborations that require shared expertise.
A. True
B. False
Answer:
False.
Explanation:
Interdisciplinary research may be defined as the research done by the team or individual that allows the integration of data, concept and tools. The interdisciplinary research is the modern type of research.
The interdisciplinary research must include more than two different subjects expertise. The physical education research do not involve the interdisciplinary research as it might includes some different subjects that are beyond the scope of discipline area.
Thus, the answer is false.
___________secrete histamine and heparin, and constitute less than 1% of all white blood cells.
Answer:
Basophils
Explanation:
Basophils are the granular leukocytes that make 0-1% of the total white blood cells. Basophils are 10–12 μm in diameter and are the spherical cells with lobed nuclei. When Wright stained, basophils appear to have large, irregularly shaped, deep-blue granules in their cytoplasm. These granules take up the basic stain and hence these cells are called basophils.
Basophils release histamine and heparin. Histamine is associated with allergic reactions. Histamine also dilates blood vessels and triggers contraction of smooth muscle. Heparin inhibits clotting and promotes blood flow. Together, histamine and heparin promote blood flow to injured tissues.
Raw shell eggs must be received in refrigerated equipment that keeps them at a temperature of _______ or less. A. 41°f B. 45°f C. 50°f D. 70°f
Answer:
B. 45°f
Explanation:
It is recommended that raw shell eggs must be stored at a temperature of 45°f or less because this ensures that the eggs will retain their quality over a long period of time. The quality of the eggs is maintained below 45°f because cool temperatures help to slow the growth of several bacteria and also helps to avoid the degradation of the eggs. The rate of degradation at higher temperatures is such that at higher temperatures the loss of quality in one day is equivalent to the loss of quality in one week when kept at temperatures lower than 45°f.To receive raw shell eggs, they must be stored in coolers that keep the air temperature at 46°C or below.
Eggs are one of the healthiest foods on the planet and can be an important part of a balanced diet. However, eggs are perishable, like raw meats, poultry, and fish. Fresh, unbroken, clean shell eggs may be contaminated with Salmonella enteritidis (SE), which can lead to foodborne illness.
Although the number of affected eggs is relatively low, there have been some cases of foodborne illness in recent years. To avoid food-borne illness, eggs must be handled safely, kept refrigerated promptly, and cooked thoroughly.
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All cells in an embryo have the same DNA. However, the embryonic cells form organs, such as the brain and the kidneys, which have very different structures and functions. These differences are the result of:_________(1) having two types of cells, one type from each parent(2) rapid mitosis causing mutations in embryo cells(3) new combinations of cells resulting from meiosis(4) certain genes being expressed in some cells and not in others
Answer:
certain genes being expressed in some cells and not in othersExplanation:
The DNA is present in every cell of the multicellular organism but that does not mean that every cell will perform the same function.
The function of the cell is decided during the cell differentiation phase the function of the cell is determined by the expression of specific genes. Expression of these genes controls the functions of the cell.
In the given question the differences in the structure and function of the brain and kidney arise due to different expression of genes in different cells.
Thus, the selected option is the correct answer.
Differences in organ structures and functions in an embryo, despite having the same DNA, result from a process called differentiation. During differentiation, embryonic cells begin expressing specific genes and take on different roles, thereby forming various organs. This gene expression is controlled by cellular signaling from the embryonic environment.
Explanation:The differences in organ structures and functions in an embryo, despite all cells having the same DNA, result from gene expression. This process is known as differentiation. During differentiation, the embryonic cells, which are initially identical and have the potential to become any type of cells (totipotent), start expressing specific genes to form different organs. This gene expression pattern is controlled by location-specific chemical signals from the embryonic environment. For instance, some cells in the ectoderm layer of the embryo will express genes specific to skin cells and differentiate into skin cells. Similarly, cells that are destined to become part of the brain, kidneys, or any other organ trigger the expression of a unique set of genes that direct those cells to develop into the proper form and function.
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Macrophages are _____.A. the best defense against parasitesB. cells that induce the lysis of virus-infected body cellsC. antigen-presenting cells that originate from neutrophilsD. large, phagocytic cells that can leave the circulation and enter the tissues of the bodyE. short-lived cells that self-destruct soon after engulfing foreign invaders
Answer: D. large, phagocytic cells that can leave the circulation and enter the tissues of the body
Explanation:
Macrophagus are the type of white blood cells. These are responsible for providing immunity to the host against the pathogenic attack. These cells engulfs and digest the foreign agents like microbes, cellular debris, cancer cells and unwanted cellular components. This process is called as phagocytosis.
The monocytes transforms into macrophagus in conditions of infection and tissue damage. These monocytes leaves the blood stream and reach at the site of affected tissue or organ.
Match the different roles of people involved in the buying center with their responsibilities.
initiators
influencers
buyers
handle the process of choosing the vendor and negotiating the price
identify the requirement for a product within the company
provide specifications about the technology needed by the company
Answer:
Initiators - identify the requirement for a product within the company
Influencers - provide specifications about the technology needed by the company
Buyers - handle the process of choosing the vendor and negotiating the price
Explanation:
The buying centre of an organisation consists of 7 different member namely Initiators, Users, Buyers, Influencers, Deciders, Approvers, Gate Keepers.
Initiators are the person who are first to suggests or initiates of the idea of buying the particular service or product. Influencer are the whose views or idea influence the decision making process. These influencers could be qualified engineers, technical personnel, consultants. Buyers are the persons who takes care of the the person who handles the paper work of the actual purchase.These buyers plays a vital role in choosing vendors. Sometimes they also helps in shaping the product specifications.Answer:
Buyers - handle the process of choosing the vendor and negotiating the price
Initiators - identify the requirement for a product within the company
Influencers - provide specifications about the technology needed by the company
Which of the following is mis-matched?
a. astrocytes - blood-brain barrier
b. ependymal cells - choroid plexus
c. ependymal cells - produce cerebrospinal fluid
d. oligodendrocytes - form myelin sheaths
e. microglia - provide support for the neuron cell body
Answer: the correct option is E. Microglia doesn't provide support for the neurone cell body.
Explanation:Microglia are located throughout the brain and is a type of neuroglia (glial cell).
As the resident macrophage cells, they act as the first form of active immune defense in the central nervous system (CNS). Their immune functions includes
Cells that absorb nutrients from the gastrointestinal tract are of what tissue type
Answer:
plasma membrane or tissues
A large forested area is fragmented into small forest tracts separated by agricultural areas. This change will most likely lead to:_________.
Answer:
Can lead to a drastic change, resulting in a decrease in the gene flow among the species of the original forest before fragmentation.
Explanation:
A forest that is divided into small pieces or areas for agricultural purposes will definitely drive away the organisms originally residing in the forest, thereby reducing the rate of mating, and subsequently decreasing the gene flow.
Agricultural areas are areas of land which are devoted to agriculture. That is, for cultivation of crops and rearing of livestock, most especially for commercial purposes.