Recall Edward Jenner's experiment, where a boy was inoculated with cowpox and, as a result, did not contract smallpox even though he was exposed to the virus. Why didn't the boy get smallpox? Select all correct choices
A. because of an "immune memory" provided
by plasma cells
B. because of an "immune memory" provided
by memory cells
C. because of a primary immune response
D. because of a secondary immune
response
B,D
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Which pattern of diploid and haploid phases reflects the life cycle in some fungi and algae, but not plants or animals?
a. alternation between haploid and diploid generations b. two haploid generations followed by a diploid generation c. one haploid generation followed by two diploid generations d. a life cycle that limits the diploid state to a single cell produced by fertilization e. a life cycle that limits the haploid state to a single cell which is immediately fertilized
The valves of bivalves are closed by the action of:
a. siphons. b. adductor muscles. c. longitudinal muscles. d. myomeres. e. mantle contractions.
Which of the following is an exception to the law of independent assortment?
a. monohybrid cross b. test cross c. gene linkage d. random mutation
The objective of the Doha (Qatar) Round of trade negotiations was to
a. increase tariffs on oil products. b. place quotas on agricultural imports to the Middle East. c. lower trade barriers between countries of varying prosperity. d. put technical barriers on intellectual property.