Final answer:
Malaria is caused by Plasmodium protozoa, transmitted by Anopheles mosquitoes, and is characterized by symptoms like fever, anemia, and organ enlargement due to the destruction of red blood cells.
Explanation:
The disease known as malaria may result in a fever, a decrease in red blood cells, and an enlarged liver and spleen. These symptoms are evidence of the effects of the Plasmodium protozoa, which cause malaria and carry out their life cycle within the human host. Anopheles mosquitoes transmit the protozoa from one human to another.
The classic signs and symptoms of malaria, such as fever and anemia, occur because Plasmodium parasites infect and destroy human red blood cells. This results in organ damage and can lead to severe anemia, blood vessel necrosis, and possibly death if not treated promptly. The most deadly species known to infect humans, Plasmodium falciparum, is responsible for the majority of malaria-related fatalities, particularly in tropical regions of the world. Preventative measures against malaria include antimalarial drugs and controls to manage mosquito populations, such as techniques to kill, sterilize, or avoid exposure to Anopheles gambiae, the primary mosquito vector of the disease.
The nucleus of a cell coordinates processes and activities that take place in the cell. Which two systems perform a similar function in the human body?
Answer:
The two systems which perform similar function in the human body are;
- The Endocrine system
and
- The Nervous system
The similarity between these two is that they bring about co-ordination. They work very closely to bring about co-ordination of activities. The hypothalamus is the important link between these two systems.
PeAcE.
The nucleus is the cell organelle vital for cell functioning. The endocrine and the nervous system perform a similar function as that of the nucleus.
What are the endocrine and nervous systems?The nervous system is the body system that comprises the nerve cells, brain, and spinal cord. They perform the activities of the control and the coordination and are important for the action-reaction.
The endocrine system is the system of the glands and organs that produce and release hormones to coordinate, control, and regulate metabolism, growth, reproduction, and other functions.
Therefore, the endocrine and the nervous system is similar to the nucleus of the cell.
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Which of the following does not occur due to passive transport?
a. the substance moves to an area of lower concentration
b. the concentration of a solution approaches equilibrium
c. the volume of a solution changes due to the movement of water
d. a concentration gradient of a dissolved substance in a solution is created
Option d, the creation of a concentration gradient of a dissolved substance in a solution, does not occur due to passive transport. Passive transport, including diffusion and osmosis, reduces existing concentration gradients, moving substances towards equilibrium.
The question asks which of the following does not occur due to passive transport. Passive transport is the movement of substances across the plasma membrane without any input of energy from the cell. The substances move from an area of higher concentration to an area where they have a lower concentration using this process.
Choices: a. the substance moves to an area of lower concentration, b. the concentration of a solution approaches equilibrium, c. the volume of a solution changes due to the movement of water, d. a concentration gradient of a dissolved substance in a solution is created.
The correct answer is d. a concentration gradient of a dissolved substance in a solution is created. Passive transport, including processes like diffusion and osmosis, involves the movement of substances down their concentration gradient until equilibrium is reached. It does not create a concentration gradient; instead, it diminishes existing concentration gradients as substances move towards equilibrium.
In an embryonic vertebrate, the apical ectodermal ridge (AER) is a thickened area at the tip of the bud. The cells of the AER secrete protein signals that promote limb-bud outgrowth, and removing the AER blocks growth of the limb along the proximal–distal axis. How would the forelimb of an embryo develop if the AER was removed early or late in limb development?
Answer:
Explanation:
The Removal of the AER results in the cessation of limb bud out-growth and a truncated proximal–distal (PD) axis
The earlier the AER is removed, the more truncated the resulting limb is, with only the very proximal structures (humerus) forming
The later the AER is removed, the less truncated the resulting limb is, with the more distal structures forming (humerus and radius/ulna)
Which is a process
Called Zone model
What specific spinal nerve branch controls the movement of rectus abdominis
Answer:
The correct answer will be-ventral ramus
Explanation:
Rectus abdominis is a skeletal muscle found in the front part of the body which begins from the sternum and ends at the pubic zone.
Rectus abdominis is also known as "Abs" which viewed externally appears to be six, eight or ten in number.
These muscles are innervated by the thoracoabdominal nerves which carry and transmit signals to CNS and to the muscles back. The main spinal nerve which controls the movement of Abs is known as the "ventral ramus".
Thus, ventral ramus is the correct answer.
Second-generation H1 antagonists cause less CNS depression because they are selective for peripheral H1 receptors and because of which other property?
Answer:
THEIR INABILITY TO CROSS THE BLOOD-BRAIN BARRIER AT THERAPEUTIC LEVELS.
Explanation:
Second-generation antihistamines (e.g., loratadine, terfenadine) lack the ability to pass through the blood-brain barrier at certain therapeutic levels.
In which muscles is overactivity or tightness common for individuals who regularly wear high heels?
Answer: Gastrocnemius, soleus, and Achilles tendon
Explanation:
The heel cord or achilles tendon is also known as calcaneal tendon is found at the back of the leg and is known to be the thickest bone in the human body.
It is attached to the plantaris, calf muscles (gastrocnemius) and soleus muscles. A person who wears heels regularly for a longer period of time suffers from pain and inflammation in muscles of leg.
These muscles helps in the walking and other movements of the legs. Wearing heals and walking is quite painful.
Relative time dating is one way that scientists can understand the relative ages of rocks and fossils. Refer to the figure above. What can you conclude about the relative ages of the labeled rock layers?
Answer:d
Explanation:
Darwin’s influence on modern scientific inquiry is largely (i)_______ ; yet while Darwin’s ideas inform fields as disparate as genetics and social psychology, one cannot help but think that each group, in (ii)_______ Darwin’s ideas, has imparted a slant that might have surprised Darwin.A) anecdotal, sub-verting B) common place, questioning C) un-contested, appropriating
Answer:
The answer is C) un-contested, appropriating
Explanation:
Although Darwinian ideas are purely biological and scientific, they have aided theoretical research in other sciences as well, psychology, in particular. The theory of evolution does not only explain the evolution of the human body, but also that of the brain. The brain's psychological mechanisms and the behaviors they produce can largely be understood through Darwin's theories; the theories of natural and sexual selection have directed much of psychological research.
In general, scientists accept Darwin's theories but in specific fields, such as social psychology and neuroscience, scientists have formulated surprising explanations using Darwinian ideas.
If a white dwarf in a binary star pair is accreting mass and it exceeds the 1.4MSun limit, it will:
Turn into a Neutron Star
Turn into a Black Hole
Turn into a Main Sequence star.
Explode
When a white dwarf in a binary star pair accretes mass and exceeds the 1.4Msun limit, it will explode in a Type Ia supernova.
Explanation:If a white dwarf in a binary star system is accreting mass from its companion and exceeds the Chandrasekhar limit of approximately 1.4 solar masses (Msun), it cannot support itself against gravitational collapse. The core temperature rises as it contracts, leading to a runaway nuclear fusion reaction, particularly of carbon. This process results in a violent explosion known as a Type Ia supernova, during which the white dwarf is completely destroyed, ejecting matter into space at high speeds and leaving no trace of the white dwarf behind.
Foreign proteins that gain access to the body through cuts and scrapes, through the digestive or circulatory systems, or through the urinary and reproductive systems are called ____.
1. mineralocorticoids
2. immunoglobulins
3. antigens
4. antibodies
Answer: option 3) antigens
Explanation:
An Antigen is any FOREIGN substance that can enters the body stimulating an immune response. It includes toxins, proteins etc, and can get into the body through ANY openings.
Therefore, antigen is the right answer
Foreign proteins that enter the body through various ways are called antigens. They trigger an immune response, leading to the production of antibodies.
Explanation:Foreign proteins that gain access to the body through cuts and scrapes, through the digestive or circulatory systems, or through the urinary and reproductive systems are called antigens. An antigen is a substance that triggers an immune response, especially the production of antibodies. Mineralocorticoids refer to a class of hormones that maintain salt and water balance and regulate blood pressure. Immunoglobulins are another name for antibodies, proteins produced by the immune system to neutralize harmful foreign substances like antigens. On the other hand, antibodies are proteins produced by B cells as a defense against antigens.
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A nonsense mutation has occurred, resulting in a truncated, nonfunctional product in the mutant. In a eukaryotic cell, a gene that is initially transcribed is 1500 nucleotides in length. The mature mRNA for the product is 1200 nucleotides in length. What is the most probable reason for the discrepancy?
Answer:
Removal of introns
Explanation:
the reduction in the sequence is as a result of the removal of introns. Introns are actually non-coding regions and do not code for proteins. they are usually spliced out.
Many organisms can reproduce asexually through mitosis, while other organisms reproduce sexually, and their cells carry out meiosis to form gametes. In a situation where an organism falls prey to many efficient predators, which of these processes would be most beneficial to a species?a) Meiosis: numerous daughter cells produced would increase the species' population.b) Meiosis: genetic variation would reduce the species' survival.c) Mitosis: numerous offspring would increase the odds that some of them would survive.d) Mitosis: numerous genetic mutations would help some individuals of the species.
Answer:
C
Explanation:
Mitosis is a growth division unlike meiosis which an organism undergoes to produce gametes or sex cells during sexual reproduction.
Mitosis is a kind of cell division that results in two daughter cells, identical in genetic composition. An organism can undergo mitosis in asexual reproduction. For each mitotic division, two daughter cells emerge (duplication division), which will propagate the number of the species.
In a case of heavy predation, the prey organism will depend on diverse number to keep its species from getting extinct. Hence, undergoing mitosis to duplicate itself asexually will be most beneficial in this scenario as a large number will increase the chance that some of them will not be a victim of predation.
Sandra Bem coined the term _____ to describe those people who possess both masculine, or instrumental, and feminine, or expressive, traits.
Answer:
Hello!
The answer is androgyny.
Explanation:
Sandra Bem was a psychologist who studied gender and gender roles. She is famously known for introducing the Gender Schema Theory and the Bem Sex-Role Inventory or BSRI which is a test that classifies individuals on the basis of male and female traits. Bem's work has helped to redefine gender roles in society.Bem stated that each individual has both masculine and feminine traits and their gender roles could be determined on the basis of score on the BSRI. She introduced the androgyny to define people who have an equal number of both masculine and feminine traits on the BSRI.Suppose you had an enzyme that recognized a sequence of six nucleotides. What are the odds that this sequence would appear in a random chain of DNA?
Answer:
The odds that this sequence would appear in a random chain of DNA is one out of two thousand and forty-eight.
Explanation:
If an enzyme recognizes a six-nucleotide pattern, the chances of that sequence being in a random sequence of DNA are one in two thousand and forty-eight.
Define nucleotides.A nucleoside as well as a phosphate make up nucleotides, which are organic compounds. They are monomeric units of a nucleic acid polymers deoxyribonucleic acid and ribonucleic acid, which are both fundamental macromolecules in all living things on Earth.
If an enzyme recognizes a six-nucleotide pattern, the chances of that sequence being in a random sequence of DNA are one in two thousand and forty-eight.
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Heparin reacts to prevent the conversion of prothrombin to thrombin. Heparin:
A) Is available in oral and parenteral formsB) Takes about 72 hours to have a therapeutic effectsC) Has its effects reversed with the administration of protamine sulfateD) Has its effects reversed with the injection of vitamin K
Answer:
The correct option is C) Heparin has its effects reversed with the administration of protamine sulfate.
Explanation:
Heparin is an anticoagulant, that is, it works by decreasing the ability of blood to clot, helping to prevent the formation of clots as well as stopping the subsequent extension of any existing clot. Through the neutralization of thrombin, it prevents the conversion of fibrinogen to fibrin, and thus, prevents the formation of a stable clot by inhibiting the fibrin stabilizing factor.
Protamine sulfate is a heparin antagonist, forming with it inactive complexes without anticoagulant effect, that is, the protamine, in the presence of heparin, which is acidic in nature, through the formation of stable salts, cancels the anticoagulant effect of both substances, neutralizing and reversing the anticoagulant action of heparin.
Heparin's effects are reversed with the administration of protamine sulfate, not vitamin K which is used for warfarin reversal. Heparin works by enhancing the activity of antithrombin III, leading to a decrease in thrombin generation and thus anticoagulation; therefore option C is correct
Heparin prevents the conversion of prothrombin to thrombin by accelerating the inhibition of thrombin by antithrombin III. It binds to antithrombin III, causing a conformational change that greatly enhances its inhibition of thrombin. Therefore, the correct answer to the question is that heparin's effects can be reversed with the administration of protamine sulfate. This is because protamine sulfate is utilized to counteract the effects of heparin in the case of excessive anticoagulation, which is a crucial aspect of managing heparin's therapeutic usage.
Vitamin K is not used to reverse the effects of heparin, but it is used to reverse the effects of warfarin, another anticoagulant that works by inhibiting the vitamin K-dependent synthesis of certain coagulation factors. Unlike heparin, warfarin takes several days to reach its full therapeutic effect and is used for long-term anticoagulation treatment.
On a weather map, isobars that _____ indicate strong winds.
A. are far apart
B. are part of a loop
C. are close together
D. cross one another
Answer:
The isobars that are close to each other indicate strong winds
Explanation:
The isobars that are close to each other indicate strong winds. The gap or spacing between two adjacent isobars represent the pressure difference between them. lower the gap between then higher is the chances of pressure difference. Therefore when two isobars are very close to each other then strong wind prevail due to movement of air to fill vaccum space
On a weather map, isobars that C. are close together indicate strong winds. Therefore , C. are close together is correct .
When isobars are close together on a weather map, it indicates a steep pressure gradient.
The pressure gradient force is directly related to the spacing of isobars; the closer the isobars, the stronger the pressure gradient force.
This force influences the speed and direction of the wind.
Here's how it works:
Pressure Gradient Force:
The pressure gradient force drives air from areas of high pressure to areas of low pressure.
The greater the pressure difference (indicated by closely spaced isobars), the stronger the pressure gradient force.
Wind Speed:
When isobars are close together, the pressure gradient force is strong, resulting in higher wind speeds.
Air moves more rapidly from high pressure to low pressure, creating strong winds.
Wind Direction:
Wind tends to flow perpendicular to the isobars, from high pressure toward low pressure. The closer the isobars, the more directly the wind is forced across them.
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A cell is treated with a drug that prevents the formation of new lysosomes. The cell continues to transcribe the genes that code for the hydrolytic enzymes that are normally found in lysosomes and continues to translate the mRNAs for those proteins on membrane-bound ribosomes.
The hydrolytic enzymes are most likely to accumulate in which of the following cellular structures?
a. Nucleus
b. Mitochondrion
c. Smooth endoplasmic reticulum
d. Golgi Apparatus
Answer:
Explanation:
The correct answer is D: Golgi apparatus.
In principle, the lysosomes are the responsible for accumulating of hydrolytic enzymes, so if the drug did not prevent the formation of lysosomes, the accumulation of hydrolytic enzymes would be in charge of the lysosomes.
But in the statement it says that the drug with which the cell is being treated prevents the formation of lysosomes, and in this case, the organelle that is most likely to perform the function of accumulating hydrolytic enzymes is the golgi apparatus.
The cellular structure that the hydrolytic enzymes would most likely accumulate is the: d. Golgi Apparatus.
The Golgi apparatus main function is to synthesize proteins. The proteins from the endoplasmic reticulum are received by the Golgi apparatus which processes them further.
The Golgi apparatus sorts proteins as well as transport the sorted proteins to their various destinations.
Materials that are to be removed from the cell are modified and processed by the Golgi apparatus before packaging them for transport out of the cell.
Since the genes for coding hydrolytic enzymes in absence of the lysosomes, where these hydrolytic enzymes would normally be found, the most likely cellular structure where the hydrolytic enzymes would accumulate is the Golgi apparatus.
The hydrolytic enzymes would be accumulated and sorted out in the Golgi apparatus.Therefore, the cellular structure that the hydrolytic enzymes would most likely accumulate is the: d. Golgi Apparatus.
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X-gal is a synthetic molecule which is a substrate for beta-galactosidase (b-gal). When cells are grown on a medium containing X-gal, they turn blue if the cells are expressing b-gal. In the absence of b-gal expression, the cells are white. You are attempting to clone a gene of interest into a lacZ reporter gene of a plasmid and introduce your recombinant molecule into a bacterial host sensitive (i.e. not resistant) to ampicillin. The plasmid contains a gene for ampicillin resistance at a position other than the cloning site. You grow your potential transformants on media containing both ampicillin and X-gal. Which of the following results would most likely indicate a successful clone?
cells which form blue colonies on the ampicillin plates
cells which form white colonies on the ampicillin plates
cells which form light blue (half blue, half white) colonies on the ampicillin plates
cells which do not grow on the ampicillin plates
None of the above results would indicate a successful clone.
Answer:
The correct answer is "cells which form white colonies on the ampicillin plates".
Explanation:
X-gal staining, also known as blue–white screen, is a common approach to detect colonies that express the gene of interest that has been incorporated into its genome. The basis of this technique is introducing the gene of interest into a vector that interrupts the expression of beta-galactosidase, which means that in a medium with X-gal the cells that were successfully transformed will be white. In this case, the cells that are transformed will also be resistant to ampicillin. Therefore if they growth in a media with both ampicillin and X-gal, a successful clone will form white colonies.
Calcium carbonate is most likely to dissolve in water with which characteristics? A.low pressure and cold temperatures B. low carbon dioxide and warm temperatures lots of carbon dioxide and cold temperatures C. lots of carbon dioxide and warm temperatures low pressure and warm temperatures
Answer:
lots of carbon dioxide and cold temperatures
Explanation:
Calcium carbonate has low solubility at room temperature and the solubility increases as the temperature decreases. The solubility of calcium carbonate also increases in water with high level of carbon dioxide due to the formation of more soluble bicarbonate.
[tex]CaCO_3_{(s)} + CO_2_{(g)} + H_2O_{(l)} --> Ca(HCO_3)_2_{(aq)}[/tex]
This is why carbon dioxide rich rainwater is able to erode limestone rocks, leading to the formation of caves, stalactites and other structures in the long run as a result of reversal of the process.
Calcium carbonate is most likely to dissolve in water that is rich in carbon dioxide and has cold temperatures. This is because CO2 reacts with water to form carbonic acid, which can then react with CaCO3 to increase its solubility.
Explanation:Calcium carbonate, CaCO3, is more likely to dissolve in water with characteristics of having lots of carbon dioxide and cold temperatures. Due to its solubility product, Ksp, we know that the solubility increases as the pH decreases (i.e., as acidity increases). The presence of carbon dioxide, CO2, in water leads to the formation of carbonic acid, which results in the following reaction:
H₂O + CO₂ = H₂CO₃
CaCO3 + H₂CO₃ = Ca²+ + 2HCO3⁻
This reaction shows that as carbonic acid is present, calcium carbonate's solubility increases because it reacts with the acid to form more soluble compounds. In natural waters that contain dissolved CO2, the solubility of CaCO3 is enhanced due to the formation of hydrogen carbonate salts. Therefore, waters that are acidic and rich in CO2 are more likely to dissolve calcium carbonate
Now, explain why ice floats. Why is 4o C the critical temperature in this story?
Answer:
Ice is less dense than water.
Water freezes at 4°C as a result of a lower number of hydrogen bond preventing the molecules from interacting. This yields ice of about 10% lower density when compared to water
Explanation:
Ice floats on water because it is less dense than water.
Water form more fixed stable hydrogen bond when it freezes preventing it from forming further hydrogen bonds or closeness with neighbouring water molecules. This explains why ice has a lesser density than liquid water when compared with most substances that has higher density in its solid form than in its liquid form.
Note:
Only At 4°C
Water is more dense
At a temperature greater than 4°C
Water is less dense
At a temperature lower than 4°C
Water is less dense
Imagine that you are a graduate student working in a cancer lab. You accidentally mix unlabeled tubes of carcinoma cells with tubes of normal epithelial cells. Which of the following is NOT a possible strategy to allow you to distinguish which tubes contain carcinoma cells?
Answer:D.D.) Suspend the cells in liquid agar culture and monitor which culture continues to grow.
Explanation
Options A-C are correct except D.
→Increase in Telomere length is indicative of abnormal growth, cancer cells can reactive telomerase to increase cell's length.
→Once a monolayer is reached; this a stage of a complete normal cell division , a cell that goes beyond this stage must be mutated. assuming all other factors are constant .
Uncontrolled cell division is an indication of virulent growth in mutated cells.
Cancer cell requires a ,medium of living host to thrive, alga medium will not support growth for carcinoma cells -the correct answer.
Completed Que.
:Imagine that you are a graduate student working in a cancer lab. You accidentally mix unlabeled tubes of carcinoma cells with tubes of normal epithelial cells. Which of the following is NOT a possible strategy to allow you to distinguish which tubes contain carcinoma cells?
A.)Monitor telomere length over time during multiple cell divisions.
B.) Plate the cells in culture and look for the culture that stops dividing once a monolayer is reached.
C.) Monitor the rate of cell division.
D.) Suspend the cells in liquid agar culture and monitor which culture continues to grow.
How do lizard species on mainland california compare in diversity to those found on islands?
Answer:
Due to more open ecological opportunities on a given island, greater differences occur between island species. A single lineage diversifies rapidly, and descendant populations occupy many habitats and ecological roles.
Explanation:
Which statement best expresses the relationship between the three structures represented below?(1) DNA is produced from protein absorbed by the cell.(2) Protein is composed of DNA that is produced in the cell.(3) DNA controls the production of protein in the cell.(4) Cells make DNA by digesting protein.
Answer:
Option number 3 that is DNA controls the production of proteins in the cell is the best relationship between the three structures which are DNA, Protein and cell.
Explanation:
DNA is an important part of every prokaryotic and eukaryotic cell. DNA stands for Deoxyribonucleic Acid. It is a long molecule made up of multiple single units called a Nucleotide. Each nucleotide contains a phosphate group (PO4), a sugar group and a nitrogenous base. DNA is composed of two long chains that wind around each other to form a double helical structure that contains genetic instructions and information regarding the development, functioning, growth and reproduction of all organisms known. This is all achieved via formation of proteins through a process known as Transcription and Translation.
Information about a particular protein formation is transcribed from a DNA into mRNA known as Transcription which is then translated into a molecule known as Protein in a process called Translation. This is how DNA controls the production of Proteins in the cells.
As far as other options in the asked question are concerned, DNA is not formed from protein but rather derived from linking up of nucleotides.
Proteins are not composed of DNA but are made up of building blocks which are known as Amino Acids. Amino Acids are organic molecules which have both a carboxyl (-COOH) and an amino (-NH2) group.
Cells do not make DNA by digesting proteins, rather proteins are degraded back into Amino acids when digested.
Final answer:
The correct statement is '(3) DNA controls the production of protein in the cell.' This reflects the core understanding of molecular biology, where DNA contains the genetic information that directs protein synthesis within the cell.
Explanation:
The correct statement that best expresses the relationship between the three structures represented in the question is: DNA controls the production of protein in the cell. This concept is a fundamental tenet of molecular biology, known as the Central Dogma. It expresses how genetic information is transcribed from DNA into mRNA (a process called transcription), and mRNA is then translated by ribosomes in the cytoplasm into proteins (a process called translation).
DNA is the hereditary material present in all cells and holds the instructions for producing proteins. Proteins, which are synthesized by ribosomes in the cytoplasm, are composed of amino acid sequences determined by the genetic code found on the DNA. The synthesis of proteins is an intricate process that starts with the DNA in the nucleus of the cell and is of vital importance because proteins perform a wide array of functions within living organisms, including acting as enzymes, signaling molecules, and structural components.
A recent study revealed that the peak thickness of the cerebral cortex occurred ________ years later in children with ADHD than in children without ADHD.
Answer:
Option C
Explanation:
Please see the attachment
Answer:true
Explanation:
Pronation of the forearm involves the inward movement of the forearm in which of the following planes?
Select one:
a. Transverse
b. Anterior-posterior
c. Sagittal Incorrect
d. Frontal
Answer:
Transverse.
Explanation:
Pronator teres is the muscle situated in the forearm with the pronator quadratus that help in the forearm pronation. This pronation result in the posterior location of the forearms.
This has two attachments the ulnar tuberosity and supracondylar ridge. This pronation result in the movement of the forearm in the transverse planes. The median nerve is innervated in the pronator teres.
Thus, the correct answer is transverse.
Which condition is characterized by excessive destruction of circulating red blood cells?
Answer:
Answer is hemolytic anemia.
Explanation:
Hemolysis is the destruction of red-blood cells, while anemia when the amount of the red blood cells in the body is lower than the expected or normal.
Therefore, hemolytic anemia can be defined as a disorder or situation where the rate at which the red blood cells are destroyed is faster compared to the rate at which they are made or produced.
This can be caused by bone marrow failure or infections, and inherited blood disorder like sickle cell disease.
The hemolytic anemia is a serious disorder that can damage the heart and other organ of the body, this is because of oxygen starvation, since the red blood cells responsible for carrying oxygen around the body have been affected.
Eating some food items like beans, green vegetables, red meat and legumes can increase red blood cell count.
Savannas differ from grasslands by having Select one:____________.a. less annual precipitation. b. lower average annual temperature. c. no grazers. d. flat-topped trees scattered throughout.
Answer:
D. flat-topped trees scattered throughout.
Explanation:
Grasslands are vast area of land covered in grass. In such environment, grasses are favor to grow but trees shrubs and other tall plants are not favored to grow.
Savannas are also vast lands that supports the growth of grasses and trees scattered across the land.
So, in savanna there are trees scattered throughout the land and grasses, but grasslands only have grasses growing in the vast area.
Which statement correctly describes a way that bacteria are used in biotechnology? A.Bacteria make human cells that make insulin. B.Human insulin coding bacterial genes are spliced into human cells. C.Human insulin made by bacteria is injected into humans. D.Bacteria that make insulin are implanted in humans.
Human insulin made by bacteria is injected into humans correctly describes a way that bacteria are used in biotechnology.
Option C
Explanation:
Human body do make insulin from the beta cells of islet of Langerhans. But in diseases like diabetes mellitus, there’s decrease in the cell count of beta cells. Thus there’s very less amount or no insulin. Thus excess insulin is required to be delivered from outside.
So bacteria are genetically engineered to produce human insulin. Insulin Aspert and Lisper are produced in this way. Thus the bacteria insulin are required for those individuals to survive and led a happy healthy life.
You strip off all proteins on the cell surface by using a protease (an enzyme that destroys proteins). Now, when you add a specific signaling molecule, the cell still responds. What is the most reasonable explanation of this?
Answer:
This is because the receptor is in the interior of the cell
Explanation:
When a specific signaling molecule is added to a cell whose cell surface has been stripped off by proteins the cell still responds because the receptor is in the interior of the cell.
Receptors are divided into two categories which are;
Intracellular receptors or internal receptors which are found in the cytoplasm or nucleus of the cell. They respond to hydrophobic ligand molecules which are able to travel across the plasma membraneCell surface receptors which are found in the plasma membraneSignalling molecules are necessary for the coordination of cellular responses by serving as ligands and binding to cell receptors.
A type of signaling molecule are the small hydrophobic ligands which can directly diffuse through the plasma membrane and interact with internal receptors unlike the water soluble ligands. This is why the cell still responds after you strip off all proteins on the cell surface.
NOTE: Nitric oxide (NO) is a gas that also acts as a ligand, therefore it can pass through the plasma membrane of the cell and interact with receptors.
The cell likely responds to the signaling molecule through an intracellular receptor since the signaling molecule can still trigger a response after cell-surface proteins are stripped away by proteolysis.
The most reasonable explanation for a cell responding to a signaling molecule after all proteins have been stripped from the cell surface by a protease might be that the signaling molecule interacts with an intracellular receptor. Since proteolysis only affects proteins on the cell surface, and the cell still responds, this suggests that the signaling molecule is likely small and hydrophobic, allowing it to cross the cell membrane and bind to an intracellular receptor instead. This interaction alters the receptor's shape or activity, thereby triggering a response within the cell without the need for cell-surface receptors.
The modern Himalayas continue to grow as a plate carrying oceanic crust subducts beneath a plate carrying continental crust.
Answer: True. The growth is as a result of and is the convergence between these crusts
Explanation:
Convergent: Continental to Continental then to Oceanic crust
A convergent boundary is created when an oceanic plate collides with a continental plate. The oceanic plates typically goes under the continental plate when this the case. The going under is because the oceanic plate is thinner and more dense than the continental plate. This type of convergent boundary is what probably create volcanic mountain ranges like Mount Rainier, the Ring of Fire. It can also cause earthquakes and some seismic activities.