Most allergy medicines contain antihistamines that block the actions of histamine. These drugs reduce cold symptoms by directly
A. stimulating components of the immune system through the release of cytokines.
B. stimulating the production of specific antibodies.
C. blocking or reducing the inflammation response in mucous membranes.
D. recruiting macrophages to the nasal epithelium.
E. lysing virus-infected cells and preventing further propagation of the pathogen.
Answer: C
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You created a worm that expresses a human Bcl-2 transgene, and you are crossing the transgene into a homozygous ced-9 mutant background. However, you inadvertantly used a clone of Bcl-2 with a mutation in the BH domain, which is essential for function. What results do you expect for the ced-9 mutants with the mutant Bcl-2 transgene?
A. 131 cells will die. B. All 1090 cells will die. C. All 1090 cells will live. D. 959 cells will die. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about the apoptosis pathway? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Based on the figure, which of the following is true of HIV?
A. It uses reverse transcriptase from the cell to make DNA.
B. It replicates in the nucleus of cells.
C. It contains DNA as its genetic material.
D. It is an enveloped virus.
E. It lyses cells when it is released.
Inherited mutant tumor suppressors produce a dominant susceptibility to cancer, but the mutant alleles are actually recessive in the cancer
Indicate whether the statement is true or false
Parental care in dinosaurs, crocodiles, and birds is an example of
A. homology caused by common descent. B. homoplasy caused by evolutionary reversal. C. homoplasy caused by convergence. D. homology caused by convergence. E. homoplasy caused by common descent.