About 75% of the outer membrane of gram-negative bacteria that might result in fatal shock is made up of endotoxins, which are glycolipid, LPS macromolecules. Hence (C) is the correct option.
Gram-negative bacteria's cell walls contain endotoxins in their outer membrane. They cannot be eliminated from materials by conventional sterilisation procedures because they cause significant immunological reactions in humans (such as fever and septic shock). Gramme negative bacteria's cell walls contain lipopolysaccharide endotoxin polymers. Gramme negative bacteria in the intestinal flora are responsible for producing endotoxins. Gramme negative bacteria do not produce LPS as an external byproduct.
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microbiologists have identified endotoxins are
A) associated with gram-positive bacteria.
B) molecules that bind nerve cells.
C) part of the gram-negative cell wall.
D) excreted from the cell.
E) A-B toxins.
a stretch of dna that is comprised of 500 nucleotides is a _________?
A.Histone
B.Anticodon
C.Codon
D.Gene
A stretch of DNA that is comprised of 500 nucleotides is a Gene.(D)
A gene is a segment of DNA that contains the information to make a functional product, usually a protein. In this case, the 500 nucleotides make up the gene. A histone (A) is a protein that DNA wraps around in the cell nucleus, forming a complex called chromatin.
An anticodon (B) is a sequence of three nucleotides found in transfer RNA (tRNA) that pairs with the complementary codon on messenger RNA (mRNA) during protein synthesis.
A codon (C) is a sequence of three nucleotides in mRNA that codes for a specific amino acid or signals the end of the protein synthesis process.(D)
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how are single-stranded regions of dna, unwound by helicases, maintained?
Single-stranded regions of DNA that are unwound by helicases are maintained through the action of nucleases and topoisomerases.
What are nucleases?
Nucleases are enzymes that cleave or break down nucleic acids, including DNA. They can help remove any damaged or unwanted single-stranded DNA regions that might otherwise interfere with normal cellular processes.
What are topoisomerases?
Topoisomerases, on the other hand, are enzymes that can temporarily break one or both strands of DNA to relieve any tension or supercoiling that might occur during DNA unwinding by helicases. This allows the helicase to continue unwinding the DNA strand without any damage or distortion.
Together, these enzymes ensure that single-stranded regions of DNA are properly maintained and protected during DNA replication and other cellular processes. Helicase unwinds the DNA by breaking the hydrogen bonds between the complementary base pairs, creating a replication fork with single-stranded regions. Topoisomerase works ahead of the helicase, relieving any supercoiling or torsional stress that may result from the unwinding process by cutting and rejoining the DNA strands. Nuclease can remove any damaged or incorrectly paired bases within the single-stranded regions, ensuring the integrity of the DNA sequence.
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1. A parent bacterial cell is able to survive in the presence of the antibiotic penicillin. Subsequent generations from this parent will be _______ penicillin.
A. Killed by
B. Vulnerable to
C. Resistant to
D. Dependent on
please help
A parent bacterial cell is able to survive in the presence of the antibiotic penicillin. Subsequent generations from this parent will be Resistant to penicillin.Hence, the correct option is C.
The parent bacterial cell is able to survive in the presence of the antibiotic penicillin, which suggests that it has some form of resistance to the antibiotic.
This resistance can be due to genetic mutations or the acquisition of antibiotic resistance genes. As subsequent generations of bacteria inherit the genetic material from their parent, they will also possess the resistance to penicillin. Therefore, subsequent generations from this parent will be resistant to penicillin.
Hence, the correct option is C.
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Analyze the graphs below. Which growth model would apply to a population of squirrels arriving on a new island? Assume the squirrels have no way to leave.
Answer using 3 to 4 complete sentences. Explain your reasoning.
For the expansion of the squirrel population on a new island, the logistic growth model would be the most suitable.
Which definition of a logistic growth model is more accurate?The logistic growth model is a model that incorporates an environmental carrying capacity to show how growth slows when a population reaches a point where the amount of resources is constrained.
How does a population expand according to the logistic model?The population increases more slowly as it approaches its carrying capacity (K), or the highest population that the environment can support, according to the population's logistic model. Every member of a population will have equal access to resources and survival prospects, according to this explanation.
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which statement is an alternative hypothesis for the experiment? changes in membrane potential are gradual when a nerve cell transmits an action potential. changes in membrane potential depend on movements of ions within cellular compartments. changes in membrane potential occur rapidly to signal an action potential. changes in membrane potential resist movements of charged ions across the membrane.
This statement proposes that there is a significant relationship between changes in membrane potential and the rapid signaling of an action potential, which contradicts the null hypothesis.
The alternative hypothesis for the experiment is the statement that contradicts the null hypothesis and proposes that there is a significant relationship between the variables being tested. In this case, the null hypothesis would be that changes in membrane potential are not affected by the movements of ions within cellular compartments.
Out of the four statements provided, the one that represents an alternative hypothesis is "changes in membrane potential occur rapidly to signal an action potential." This statement proposes that there is a significant relationship between changes in membrane potential and the rapid signaling of an action potential, which contradicts the null hypothesis.
The other three statements do not represent alternative hypotheses because they do not propose a significant relationship between the variables being tested.
"Changes in membrane potential are gradual when a nerve cell transmits an action potential" and "changes in membrane potential resist movements of charged ions across the membrane" are simply describing the behavior of membrane potential without proposing any relationship to the movements of ions.
"Changes in membrane potential depend on movements of ions within cellular compartments" does propose a relationship between the two variables, but it does not contradict the null hypothesis that there is no significant relationship.
In conclusion, the statement "changes in membrane potential occur rapidly to signal an action potential" represents an alternative hypothesis for the experiment.
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the diagram below shows a model of species divergence among some primates. if this model is correct, the greatest genetic differences would be found in the dna sequences of which two species? responses tarsius bancanus and cebus albifrons tarsius bancanus and cebus albifrons macaca sylvanus and macaca mulatta macaca sylvanus and macaca mulatta hylobates lar and pongo pygmaeus hylobates lar and pongo pygmaeus pan troglodytes and lemur catta
C. Hylobates lar and Pongo pygmaeus would be the greatest genetic differences would be found in the DNA sequences of which two species.
The lar gibbon, frequently referred to as a white-handed gibbon, is a critically endangered ape in the Hylobatidae family of gibbons. It is a well-known gibbon that is frequently maintained in captivity.
The white-handed gibbon, also known as the Lar Gibbon, is deemed endangered. This is owing in part to Thailand's thriving illicit pet trade, whereby they are sought, captured, exchanged, and exploited. Forest clearing of their forest environment is also a hazard and is becoming a bigger issue.
They are vegetarians who primarily consume fruit. They also consume vegetation, birds, bird eggs, and vermin. Leopards, tiger-like pythons, and eagles are among the predators of lar gibbons.
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Complete question:
The diagram below shows a model of species divergence among some primates. If this model is correct, the greatest genetic differences would be found in the DNA sequences of which two species?
A. Tarsius bancanus and Cebus albifrons
B. Macaca sylvanus and Macaca mulatta
C. Hylobates lar and Pongo pygmaeus
D. Pan troglodytes and Lemur catta
an infant who is weaned too soon may _____ because of decreased total energy intake.
An infant who is weaned too soon may experience malnutrition because of decreased total energy intake.
This is because breast milk or formula provides essential nutrients and calories needed for proper growth and development. If weaning occurs before the infant is ready or if the transition to solid foods is not done properly, the infant may not receive enough calories and nutrients to meet their needs.
This can lead to malnutrition, which can have serious long-term consequences on physical and cognitive development. It is important for caregivers to follow appropriate weaning guidelines and consult with a healthcare professional if there are any concerns about the infant's nutrition.
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Ch 15
The nurse is admitting the patient to the nursing unit at the hospital. the nurse is concerned that the patient is at risk of deep vein thrombosis because of which of the following risk factors? Select all that apply.
A. Pt's advanced age
B. Pt's admitting diagnosis of cancer
C. Pt's stated drug allergy to aspirin
D. Pt's history of of prior venous thrombosis
E. Pt's low protein diet
The following risk factors for deep vein thrombosis (DVT) are:
A. Pt's advanced age
B. Pt's admitting diagnosis of cancer
D. Pt's history of prior venous thrombosis
Advanced age is a risk factor for DVT because the risk of developing blood clots increases as we age. Admitting diagnosis of cancer also increases the risk of DVT, as cancer cells can release substances that increase the risk of blood clots. A history of prior venous thrombosis is also a significant risk factor for developing DVT again.
Option C, Pt's stated drug allergy to aspirin, is not a risk factor for DVT. In fact, aspirin is often used as a preventative measure for DVT in some patients.
Option E, Pt's low protein diet, is not a significant risk factor for DVT.
Therefore, the correct options are A, B, and D.
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explain how the type of hemolysis can be used to tell apart two species that would look the same under the microscope.
Hemolysis is the process of breaking down red blood cells. It can be used as a diagnostic tool to differentiate between different bacterial species.
Bacteria can produce different types of hemolysins that can cause different types of hemolysis: alpha, beta, and gamma hemolysis. Alpha hemolysis is a partial breakdown of red blood cells, resulting in a greenish discoloration of the blood agar around the bacterial colonies. Beta hemolysis is a complete breakdown of red blood cells, resulting in a clear zone around the bacterial colonies. Gamma hemolysis is the absence of hemolysis. If two bacterial species look the same under the microscope, their hemolytic patterns can be used to differentiate them.
For example, if two species produce the same colony morphology on a blood agar plate, but one of them shows beta hemolysis and the other shows alpha hemolysis, they can be identified as two different species. Similarly, if one species shows gamma hemolysis, it can be distinguished from the other two. Hemolysis testing is a simple and inexpensive method for identifying bacterial species and can be used in combination with other tests, such as biochemical tests or molecular methods, to confirm the identification of a bacterial isolate.
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How can we test whether a given plant is photosynthesis or not?
Answer:
One of the leaves will turn blue-black and the other will turn reddish-brown when you apply iodine to them.
Explanation:
Iodine is an indicator that changes colour from blue to black when starch is present. The leaf that was in the light changes from green to blue-black, showing that it has been undergoing photosynthesis and producing starch.
below is an example of an evolutionary pressure we discussed called genetic drift. what happens to the dominant and recessive alleles in a population in this type of scenario? genetic drift group of answer choices individuals that are homozygous dominant, homozygous recessive and heterozygous have an equal, random chance of being eliminated from the population. the dominant allele is selected for in this scenario, leaving the recessive allele to be eliminated. the dominant allele is selected against in this scenario, leaving the recessive allele to thrive. the dominant and recessive allele mutate to be able to remain in the population.
Individuals that are homozygous dominant, homozygous recessive, or heterozygous have an equal, random risk of disappearing from the population due to genetic drift.
What is an effective example of evolution drift?Genetic drift most obviously displays itself in the bottleneck effect, a phenomenon that occurs when a population is significantly decreased in size. For instance, a natural disaster can completely wipe out a population, killing most of the inhabitants and leaving behind a few scattered survivors.
What does genetic drift mean in the context of evolution?Genetic drift is the random variation in frequency of a gene variant that already exists in the population. Genetic drift may limit genetic diversity by causing gene variants to completely vanish.
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microorganisms that may cause meningitis include all of the following except: group of answer choices viruses. proteus. bacteria. fungi.
Microorganisms that may cause meningitis include viruses, bacteria, and fungi.
Various microorganisms can cause meningitis, including viruses, bacteria, and fungi. Viral meningitis is typically less severe than bacterial meningitis and is more commonly seen in children. Bacterial meningitis, on the other hand, can be life-threatening and requires immediate medical attention.
The most common bacteria that cause meningitis are Streptococcus pneumoniae and Neisseria meningitidis. Fungal meningitis is rare but can occur in people with weakened immune systems. Proteus is a type of bacteria that can cause infections in humans, but it is not a common cause of meningitis.
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7. Explain how much the recent birds vary from the original birds after 1 million years of natural selection. How does evolution explain the changes? Use the following terms or phrases in your explanation: natural selection, random mutation, nonrandom selection of favorable traits, reproduction, genetic variation, and extinction. Please help
The recent birds differ from the original birds in many morphological features like beak shape, feathers and many other features depending upon the environmental factors. These differences are the result of mutations and natural selection.
Natural selection is the phenomenon in which the species which are more fit and are able to reproduce fertile offspring are selected to live by the nature while the rest undergo extinction. Natural selection occurs due to nonrandom selection of favorable traits.
Mutation is the change in the genetic sequence of an individual's DNA. Mutations are random are nature which cause genetic variation. The process of meiosis during reproduction also causes genetic variations.
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explain why the hybrid gene mrna transcript does not undergo 3' cleavage and polyadenylation.
The hybrid gene mRNA transcript does not undergo 3' cleavage and polyadenylation because of the potential effects of alternative splicing, premature termination, and altered gene structure that can result from the fusion of two separate genes.
The hybrid gene mRNA transcript does not undergo 3' cleavage and polyadenylation due to the following reasons:
1. Alternative splicing: Hybrid genes are formed through the fusion of two separate genes. This can lead to alternative splicing events that might eliminate the 3' cleavage site and polyadenylation signal, preventing the transcript from undergoing the usual 3' processing.
2. Premature termination: The fusion event may lead to premature termination of the transcript, resulting in the loss of the 3' cleavage site and polyadenylation signal, thereby preventing 3' cleavage and polyadenylation.
3. Altered gene structure: The fusion of two separate genes might disrupt the gene structure, specifically the 3' untranslated region (3' UTR) which contains the cleavage and polyadenylation signals. If these signals are disrupted or absent, the hybrid gene mRNA transcript will not undergo 3' cleavage and polyadenylation.
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all people are born with natural capacities for growth and fulfillment according to
All people are born with natural capacities for growth and fulfillment according to humanistic psychology.
Humanistic psychology believes that all people have a natural inclination towards personal growth, self-actualization, and fulfillment, which can be achieved through conscious effort and self-reflection. This perspective highlights the importance of an individual's subjective experience, personal values, and unique qualities in understanding their behavior and development.
Humanistic psychologists also stress the significance of positive interpersonal relationships, empathy, and authenticity in promoting personal growth and wellbeing. They advocate for a holistic approach to mental health, which integrates the physical, emotional, and spiritual aspects of an individual's life.
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The complete question is:
Fill in the blanks:
All people are born with natural capacities for growth and fulfillment according to ________
please help me will give brainliest
Answer:Succession that begins in new habitats,
Explanation: uninfluenced by pre-existing communities is called primary succession, whereas succession that follows disruption of a pre-existing community is called secondary succession.
if a homozygous dominant genotype and a homozygous recessive genotype crossed the resulting offspring genotype must be
When a homozygous dominant genotype (like AA) crosses with a homozygous recessive genotype (like aa), the ensuing offspring genotype must be the heterozygous Aa.
What genotypic ratio should be anticipated in a homozygous recessive/dominant cross?A monohybrid cross has a 3:1 phenotypic ratio and a 1:2:1 genotypic ratio.
What is the likelihood that a homozygous dominant individual will cross with a heterozygous individual to produce a homozygous recessive offspring?There is a 50% chance that the offspring of a heterozygous individual and a homozygous dominant individual will be heterozygous. Additionally, there would be a 50% chance that the progeny would be homozygous dominant and a 0% chance that they would be homozygous recessive.
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Question:
If a homozygous dominant genotype and a homozygous recessive genotype are crossed, what will be the genotype(s) of the resulting offspring?
What is the starch component that is responsible for gel formation?
The starch component responsible for gel formation is amylopectin.
Amylopectin is a branched polysaccharide and a major component of starch, accounting for approximately 70-80% of the total starch content in plants. It plays a crucial role in gel formation due to its unique molecular structure.
The branched structure of amylopectin, with alpha-1,4-linked glucose units and alpha-1,6-linked branching points, allows it to form a network in water during the gelatinization process. As starch granules are heated in water, the amylopectin chains absorb water, swell, and eventually form a gel-like structure.
This gel formation is responsible for the thickening and viscosity observed in many starch-based food products, such as sauces, gravies, and puddings. Amylopectin's properties are also influenced by factors such as temperature, pH, and the presence of other molecules, which can affect the quality and stability of the gel.
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if a signal sequence is removed from an er protein, what happens to the altered protein? choose one: it is immediately degraded. it is unable to exit the er. it remains in the cytosol. it is escorted to the er by chaperone proteins. it can enter any organelle other than the er.
If a signal sequence is removed from an er protein, the altered protein is b. it is unable to exit the er.
A freshly synthesised protein is directed to the endoplasmic reticulum (ER) for further processing and sorting by the signal sequence, which is a brief stretch of amino acids near the protein's beginning. The cellular machinery in charge of protein trafficking will not recognise and carry the protein to the ER if this signal sequence is eliminated. Alternate proteins are more likely to stay in the cytosol and be broken down by the cell's quality assurance mechanisms.
Proteins may occasionally detect the changed protein and guide it to the ER for processing, although this is not always the case and depends on the altered protein's particular characteristics. The changed protein also has a low likelihood of entering any organelle other than the ER since each organelle has unique protein import mechanisms and recognition signals.
Complete Question:
If a signal sequence is removed from an er protein, what happens to the altered protein?
a. it is immediately degraded.
b. it is unable to exit the er.
c. it remains in the cytosol.
d. it is escorted to the er by chaperone proteins.
e. it can enter any organelle other than the er.
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true or false altruism can only evolve via kin selection (among individuals who share alleles by descent)
" Altruism can only evolve via kin selection (among individuals who share alleles by descent). The given statement is true.
Kin selection is a concept in evolutionary biology that suggests that altruistic behaviors are more likely to evolve when directed towards close relatives who share alleles (genetic material) by descent, because in doing so, the altruistic individual is indirectly promoting the survival and reproduction of its own genes.
The idea is that altruistic behaviors that reduce an individual's own reproductive success can still increase the reproductive success of close relatives who share similar genetic material. This is because the relatives carry copies of some of the same genes, including those that may predispose them to exhibit similar altruistic behaviors.
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should the development of a more complex body system in vertebrates be considered an improvement over the simpler body systems of invertebrates?
answer: d
Explanation: yes because the body's system
Yes, the development of a more complex body system in vertebrates be considered an improvement over the simpler body systems of invertebrates
Explanation :The evolution of a more sophisticated body system in vertebrates can be regarded a benefit over the simpler body systems of invertebrates since their complex anatomy and physiology provide a considerable advantage over invertebrates in the natural world. A body system becoming more complex is not always a good thing, though. An animal will remain in the phylum as long as a straightforward mechanism enables it to live and reproduce successfully in a given habitat.
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How is citrate created, and at what point in metabolism does this event take place? Be sure to watch the video to see this reaction in motion.
a.
Acetyl-CoA reacts with oxaloacetate in the TCA cycle.
b.
Acetyl-CoA reacts with 2-oxoglutarate in the TCA cycle.
c.
Acetyl-CoA reacts with oxaloacetate during glycolysis.
d.
Succinyl-CoA reacts with pyruvate in the TCA cycle.
Citrate is created when acetyl-CoA reacts with oxaloacetate in the TCA cycle.
This reaction takes place in the mitochondria of cells and is catalyzed by the enzyme citrate synthase. The acetyl group from acetyl-CoA is transferred to oxaloacetate to form citrate, which is then further metabolized in the TCA cycle to produce energy.
This reaction can be seen in motion in the video. Therefore, the correct option is (a) Acetyl-CoA reacts with oxaloacetate in the TCA cycle.
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Police stop Richard for driving erratically at 3 AM and give him a breathalyzer test, which he fails
miserably because of
A. the thinness of his respiratory membranes.
B. the thickness of his respiratory membranes.
C. the excellent condition of his alveoli.
D. excess surfactant secreted in response to alcohol.
Police stop Richard for driving erratically at 3 AM and give him a breathalyzer test, which he fails miserably because of excess surfactant secreted in response to alcohol. The correct answer to this question is D.
When Richard is stopped by the police and given a breathalyzer test, he fails it miserably because of the excess surfactant secreted in response to alcohol. Surfactant is a substance that is present in the lungs to help reduce surface tension and prevent the alveoli from collapsing. However, when there is an excess of surfactant present, it can interfere with the accurate measurement of breath alcohol content during a breathalyzer test.
Alcohol consumption can cause the secretion of excess surfactant in the lungs, which can lead to a false-positive reading on a breathalyzer test. When a person consumes alcohol, it can irritate the respiratory membranes in the lungs and trigger the production of excess surfactant. This can lead to a greater amount of alcohol being retained in the lungs and exhaled during a breathalyzer test, leading to a false reading.
The correct answer is D because excess surfactant secreted in response to alcohol can interfere with the accuracy of breathalyzer tests. It is important to note that alcohol consumption can have serious consequences and can impair a person's ability to drive safely. It is always best to avoid drinking and driving to prevent accidents and keep oneself and others safe.
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What iron is a part of hemoglobin and myoglobin?
The iron that is a part of both hemoglobin and myoglobin is heme iron.
Heme is a compound that contains iron and is responsible for the red color of blood. It binds to oxygen and allows for its transport in the blood through hemoglobin, which is found in red blood cells, and myoglobin, which is found in muscle cells. Iron is a crucial component of both hemoglobin and myoglobin. In hemoglobin, iron binds to oxygen in the lungs and carries it to tissues and cells throughout the body. In myoglobin, iron stores oxygen in muscle cells, providing a readily available oxygen supply for muscle contraction. Iron is essential for the proper functioning of these proteins and their roles in oxygen transport and storage.know more about "iron" here: https://brainly.com/question/14964747
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albinism is an autosomal (not sex-linked) recessive trait where the affected individual lacks melanin pigmentation. a man and woman are both of normal pigmentation and have one child out of three who is albino. what are the genotypes of the albino child's parents?
If a man and woman have one child out of three who is albino, this suggests that both parents are carriers of the recessive allele for albinism.
In other words, both parents have one normal allele and one mutant allele for the gene that controls melanin pigmentation. If we designate the normal allele as "A" and the mutant allele as "a," then the genotypes of the parents would be Aa (one normal allele and one mutant allele) for each parent. The albino child would inherit one mutant allele from each parent, resulting in the aa genotype and the absence of melanin pigmentation.
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How do different types of coral species contribute to the biodiversity of coral reefs, and how does this biodiversity support the overall health of the ecosystem? Provide examples from Florida reefs.
Coral reefs are critical ecosystems for undersea life, they protect coastal regions by lessening the strength of waves hitting the coast, and they provide a vital source of income for millions of people. Coral reefs are teeming with life. On a single reef, thousands of species can be found.
How do coral reefs benefit the environment?Coral reefs sustain more species per unit area than any other marine habitat, including over 4,000 fish species, 800 hard coral species, and hundreds of other species. Scientists believe that there are millions of unknown critters living in and near coral reefs.
The greatest worldwide risks to coral reef ecosystems are rising ocean temperatures and changing ocean chemistry.
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which metallic element is given in minute quantities to poultry to kill parasitic growth in the birds?
The metallic element required in minute quantities to kill the parasitic growth in the poultry is: (c) arsenic.
Poultry refers to the groups of birds domesticated by the humans for commercial purposes like the selling of their egg, meat or feathers. The example of birds which are the part of poultry are fowl, ducks, geese, hens, turkey, etc.
Arsenic is a naturally existing chemical compound. The compound when given to the poultry in very minute quantities, kills their microbiome without harming the birds themselves. Arsenic is also known to improve the flesh of the birds as well as promote their growth.
Therefore, the correct answer is option c.
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The given question is incomplete, the complete question is:
Which metallic element is given in minute quantities to poultry to kill parasitic growth in the birds?
a. copper
b. iron
c. arsenic
d. lead
b.consider the real shape of a red blood cell and allow the cell to deform as it passes through a pore of radius r. assume that the red blood cell is cylindrical with hemispherical ends. taking cell membrane area as 130um2, what is the minimum r value? you will get a cubic equation for r that you need to solve numerically.
The minimum radius of the pore that the red blood cell can pass through without breaking is approximately 4.53 μm.
To solve for the minimum radius, we need to use the formula for the surface area of a cylindrical object with hemispherical ends, which is given by;
A = 2πrh + πr²
where A will be the surface area, r will be the radius, and h will be the height of the cylindrical part of the cell.
We can rearrange this equation to solve for the height;
h = (A - πr²) / (2πr)
Now, when the cell passes through a pore of radius r, it will deform to fit the shape of the pore. The minimum radius of the pore that the cell can pass through without breaking is when the surface area of the cell is equal to the surface area of the pore. Therefore, we can set the surface area of the cell equal to the surface area of the pore, which is given by:
A = 4πr²
We can then substitute this expression for A into the equation for h;
h = (4πr² - πr²) / (2πr)
h = (3r) / 2
Now, we can substitute this expression for h back into the equation for the surface area of the cell to get;
A = 2πr(3r/2) + πr²
A = 3πr²
Finally, we can substitute the given cell membrane area of 130 μm^2 into this expression and solve for r;
130 μm² = 3πr²
r² = 130 μm² / (3π)
r ≈ 4.53 μm
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bacteria, pollen, and transplanted tissue are examples of group of answer choices foreign antibodies. pyrogens. foreign antigens. chemotactic chemicals. self antigens. previousnext
Bacteria, pollen, and transplanted tissue are examples of option C: foreign antigens.
An antigen is any foreign substance that selectively attaches to a lymphocyte-made receptor molecule, typically one of a complex nature and frequently a protein. Antigens are chemicals found on the surfaces of invasive microbes such as viruses, bacteria, protozoans, and fungi as well as on foreign substances such as pollen, dust, or transplanted tissue.
The interaction of an antigen with a receptor molecule may or may not result in an immunological response. Antigens that trigger this response are known as immunogens. A transplanted tissue is considered as an antigen by our immune system and may provoke an immune response. Leukocytes are usually activated in an immune response to fight against the antigen.
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Correct question:
Bacteria, pollen, and transplanted tissue are examples of ?group of answer choices:
foreign antibodies.
pyrogens.
foreign antigens.
chemotactic chemicals.
self antigens.
An important difference between DNA and RNA is that
A. RNA has two strands and DNA has one strand
B. RNA has one base different from those in DNA
C. RNA is only in single base units but DNA is in long strands
D. RNA is made in the lab but DNA is in living things
Answer:
B. RNA has one base different from those in DNA.
The difference between DNA and RNA lies in the structure of their sugar molecules and the nitrogenous bases they contain. DNA has a deoxyribose sugar, while RNA has ribose sugar. Also, RNA has uracil as one of its nitrogenous bases, while DNA has thymine instead. Uracil can bind with adenine during transcription, while thymine binds with adenine during DNA replication. RNA is also typically single-stranded, while DNA is double-stranded.