Antigen exposure is necessary to stimulate B cells to

a. produce soluble antibodies.
b. differentiate to plasma cells.
c. induce genetic hypermutation in B cells.
d. do all of the above.


Answer: D

Biology & Microbiology

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Contact inhibition is an important mechanism for maintaining cell growth in developed organs and tissues. As long as

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a. prophase b. G1

c. G2 d. G0 e. S

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The collection of deleterious alleles in a population is called the

A) mutation load. B) mutation bottleneck. C) genetic load. D) genome polymorphism.

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During the day, an open stomata loses about ____ molecule(s) of water for every molecule of carbon dioxide it takes

in. a. 1 b. 10 c. 25 d. 100 e. 400

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Actin filaments associate with a nucleotide triphosphate.

a. true b. false

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