The most dangerous type of arrhythmia is
a. tachycardia.
b. ventricular fibrillation.
c. brachycardia.
d. atrial fibrillation.
e. an electrocardiogram
B
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Which of the following statements about cellular metabolism is FALSE?
A) Glycolysis is inhibited when cellular energy levels are abundant. B) Citric acid cycle activity is dependent solely on availability of substrate; otherwise it is unregulated. C) In the electron transport chain, electrons decrease in energy level as they are transferred from one electron carrier to the next. D) Reactions of the citric acid cycle take place in the mitochondrial matrix.
What is an assumption of group selection?
A. infanticide B. lack of immigration C. no natural selection D. high rates of mutation E. resource prediction
A replicon
a. may or may not have an origin. b. must include the gene for the protein that regulates initiation of replication. c. must "fire" only once during the cell cycle. d. must have a terminus. e. is trans-acting.
Which cells are likely to have a higher cellular water potential?
A. sieve-tube elements near source tissues B. sieve-tube elements near sink tissues