In constructing phylogenetic trees, it is useful to think of monophyletic groups as being defined by ________
A) apomorphies
B) plesiomorphies
C) synapomorphies
D) clades
C
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If the number of people who become ill during an epidemic rises and falls rapidly, this is called a(n)
A. propagated epidemic. B. promulgated epidemic. C. common source epidemic. D. index epidemic.
The transition of the early earth’s atmosphere from
one rich in hydrogen to one rich in oxygen may be attributed to a. photosystem II. b. photosystem I. c. the cyclic pathway of photosynthesis. d. the light-independent reactions. e. the activity of the electron transfer chain.
Ca2+-calmodulin stimulates phosphorylation of myosin by
A) Ca2+-ATPase. B) focal adhesion kinase. C) myosin light chain kinase. D) ryanodine receptor. E) titin.
When an electrical impulse traveling along a motor neuron arrives at a neuromuscular junction
A) there is an increase in the secretion of acetylcholine at the neuromuscular junction. B) calcium is transported back to the sarcoplasmic reticulum. C) sliding of actin and myosin filaments is inhibited. D) myosin-actin cross-bridges are destroyed. E) a new electrical impulse is generated that returns the message to the original nerve.