Actin filaments associate with a nucleotide triphosphate.
a. true
b. false
Answer: a. true
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Choose the true statements about molecular clocks.
_____ All molecular clocks tick at the same rate. _____ Molecular clocks can be calibrated using fossil evidence. _____ The rate of a molecular clock for a given DNA character might vary depending on how constrained the character is by natural selection. _____ Ultimately, all molecular clocks depend on the rate of DNA mutation and DNA repair mechanisms.
A cat undergoing surgery has a hemorrhage of 20 ml of blood, from a total blood volume of about 220 ml. How would you expect the cat's blood pressure to respond, assuming the hemorrhage is stopped but no other action is taken?
A. Blood pressure may drop temporarily, then normalize. B. Blood pressure will increase for a few hours. C. The blood pressure response would depend on whether the hemorrhage is internal or external. D. Blood pressure may increase temporarily, then normalize. E. Blood pressure will decrease for a few hours.
The variable region of an antibody occurs
A. only on the heavy chains. B. only on the light chains. C. on one of the light chains. D. on all four chains.
The process of a high-energy "donor" molecule physically transferring a phosphate group to ADP is called
A. substrate-level phosphorylation. B. glycolysis. C. oxidative phosphorylation. D. photosynthesis. E. electron transport.