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
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Contact inhibition is an important mechanism for maintaining cell growth in developed organs and tissues. As long as
the cells maintain contact with each other, they remain in ____ and are prevented from dividing.
a. prophase b. G1
c. G2 d. G0 e. S
The collection of deleterious alleles in a population is called the
A) mutation load. B) mutation bottleneck. C) genetic load. D) genome polymorphism.
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
Actin filaments associate with a nucleotide triphosphate.
a. true b. false