Which of the following is a characteristic of a beneficial mutation?
A. It improves successful reproduction.
B. It decreases lifespan.
C. It has no effect on phenotype.
D. It decreases an organism's fitness.
A
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What class of membrane-transport protein is associated with triggering an action potential?
A. a pump protein B. a ligand-gated ion channel C. a voltage-gated ion channel D. a sodium/potassium symporter
Several infections of the cardiovascular system can be identified by inspecting a stained blood smear in the microscope. For the following infections, identify the microscope observation that does not fit the disease.
A. Chagas disease; protozoan visible among blood cells B. Malaria; ring trophozoites visible inside red blood cells C. Epstein-Barr virus; virus visible inside red blood cells D. Babesiosis; protozoan visible inside red blood cells
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What will be an ideal response?
Acyclovir is used to treat
A. influenza A virus. B. respiratory syncytial virus. C. shingles, chickenpox, and genital herpes. D. HIV. E. hepatitis C virus.