Each of the following statements about the citric acid cycle is true except
A) Oxidation by transfer of electrons to coenzymes occurs at two steps.
B) Decarboxylation to release CO2 occurs at two steps.
C) Substrate-level phosphorylation generates ATP/GTP at one step.
D) Acetate enters the citric acid cycle and joins a four-carbon acceptor molecule to form citrate.
E) The cycle involves the ordered activity of eight enzymes.
Answer: A
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What is the portion of the cell cycle during which the chromosomes are invisible under the light microscope because they are not yet condensed?
A. Interphase B. Prophase C. Metaphase D. Anaphase E. Telophase
Optimal foraging as a form of efficient behavior would be favored by
A. associative learning. B. operant conditioning. C. energy expended. D. natural selection. E. None of these choices are correct.
The function of carbonic anhydrase is
a. to speed up the conversion of CO2 and H2O into HCO3 ? and H+. b. to speed up the conversion of HCO3 ? and H+ into CO2 and H2O. c. to speed up the rate at which CO2 binds to hemoglobin. d. to speed up the conversion of CO2 and H2O into HCO3 ? and H+, and to speed up the conversion of HCO3 ? and H+ into CO2 and H2O. e. to speed up the conversion of HCO3 ? and H+ into CO2 and H2O, and to speed up the rate at which CO2 binds to hemoglobin.
Feathers in birds appear to have first evolved for insulation but later conveyed a new advantage in helping create light aerodynamic surfaces. the switch in function is an example of a(n) ____________.
A. Paedomorphosis B. An analogy C. Exaptation D. An adaptation