Which cytoskeletal proteins are important constituents of the contractile structures that form the cleavage furrows involved in animal cell cytokinesis?
A) actin
B) dynein
C) tubulin
D) myosin
Answer: A
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Most birds are __________; most mammals are
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a. vomiting b. overuse of antacids c. hormonal disorders d. increased carbon dioxide excretion e. kidney failure causing decreased H+ excretion
In humans, the oxygen concentration of the blood is the most important chemical stimulus for regulating the rate of
respiration. Indicate whether the statement is true or false.