What feature of mycobacteria is responsible for the unusually slow growth of these bacteria?
A. Their low tolerance for oxygen retards their growth.
B. They cannot fully metabolize carbohydrates and must rely on fermentation.
C. They have limited numbers of ribosomes so protein production is slow.
D. The mycolic acid in their cell walls requires signification metabolic investment.
E. They lack a cell wall and are extremely fragile.
Answer: D
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What is the effective population size of the Florida panther if only 20 males are breeding with 50 females?
A. About 4 individuals B. About 14 individuals C. About 57 individuals D. About 70 individuals E. About 80 individuals
An increase in sympathetic nervous activity to arterioles will have little effect on vasoconstriction of the
A) brain and heart. B) heart and kidneys. C) kidneys. D) skeletal muscles. E) gastrointestinal tract
Not all human activities contribute to heating of the atmosphere. Which of the following has a net effect favoring atmospheric cooling?
A) production of CO2 B) production of methane, nitrogen oxides, and chlorinated hydrocarbons C) production of ozone D) effects on albedo of the earth's surface E) all of the above
The following events occur in cellular immunity, leading to a response from TH cells. What is the third step?
A) Antibodies are produced. B) Dendritic cell takes up antigen. C) Antigen enters M cell. D) TH cell produces cytokines. E) TH cells proliferate.