The binding of ____to ____ directly triggers the power stroke in skeletal muscle contraction
a. myosin; actin
b. tropomyosin; myosin
c. myosin; troponin
d. tropomyosin; actin
e. troponin; tropomyosin
ANSWER: a
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The ocean has mitigated the impact of anthropogenic carbon dioxide production by
A) absorbing 500 billion tons of atmospheric carbon dioxide. B) absorbing over 80% of the trapped heat energy. C) storing 600 billion tons of organic carbon. D) absorbing 500 billion tons of atmospheric carbon dioxide and over 80% of the trapped heat energy.
Approximately ________ million years ago the amniotes branched off from their amphibian ancestor
a. 300 b. 250 c. 355 d. 180 e. 425
The upper distribution of tropical intertidal nerites can be found in the ____ zone
a. brown. b. white. c. gray. d. black. e. yellow
Each of the following is a challenge faced by a terrestrial plant except
A) buoyancy. B) desiccation. C) cells and tissues to maintain structure. D) variability in air temperature.