Which of the below is responsible for the single direction of action potential propagation?
A. The one-way valves in the axon
B. The refractory period
C. The Na+ leak channels in the axon
D. The Ca+ / K+ pump
Ans: B. The refractory period
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In the process of noncyclic photophosphorylation
A. photosystems I and II are both required. B. water is split to form oxygen gas. C. electrons from water flow through electron transport chains resulting in synthesis of ATP and NADPH. D. All of the choices are correct.
Which of the following, pertaining to prokaryotic cell membranes, is mismatched?
A. function - regulates transport of nutrients and wastes B. form a bilayer - phospholipids C. internal folds - mesosomes D. unique hydrocarbon present - cyanobacteria E. sterols present - mycoplasmas
What would you expect to happen to the pH of an unbuffered solution if a few drops of acid were added?
A) The pH would increase. B) The pH would remain the same. C) The pH would decrease. D) The pH would become neutral. E) The pH would increase and then rapidly decrease.
What is not a method used by ectotherms to affect body temperature?
A. Countercurrent heat exchange B. Shivering C. Basking in the sun D. Increasing metabolic rate E. Dilation or contraction of blood vessels in skin