Preassembled nucleation sites in a living cell are equivalent to intracellular preference for actin.
a. true
b. false
Answer: a. true
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What cytoskeletal protein is phosphorylated by the M cyclin-CDK complex?
A. microfilaments B. microtubules C. intermediate filaments D. All of the above are correct.
The signal to "rest and digest" comes from the:
A. somatic system. B. parasympathetic system. C. peripheral system. D. sympathetic system.
In lakes and ponds, photosynthesis occurs primarily in the
A) benthic zone. B) profundal zone. C) limnetic zone. D) lotic zone.
Which factor has dramatically decreased infant mortality in human populations?
A) a shift from an agricultural to an industrial economy B) the use of pesticides to reduce mosquito populations C) the choice made by educated women to have fewer children D) an increase in poverty in developed countries