Carnivores are indicated by
a. A.
b. B.
c. C.
d. D.
e. E.
Answer: c
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A linear depiction of energy flow in an ecosystem is a(n):
a. food web. b. food chain. c. trophic web. d. ecological pyramid. e. pyramid of numbers.
Which of the following statements is false?
a. The best option for a vaccine against AIDS may be an engineered virus. b. HIV genes mutate faster than the immune system can form antibodies against their products. c. Home test kits are as accurate as those used in clinics d. It is very difficult to form a vaccine against all the mutated forms of HIV. e. The prevention of the spread of HIV currently depends upon implementing behavioral controls through education.
Which type of hormone releases cyclic AMP as a second messenger?
A. Peptide only B. Steroid only C. Protein only D. Peptide and protein only E. peptide, steroid, and protein
Which of the following is NOT a characteristic of a primary immune response?
A) The response is especially strong. B) The response is short-lived. C) Antigen-selected B or T cells differentiate into effector cells. D) Antigen-selected B or T cells proliferate E) It requires 10-17 days to initiate.