________ (PC) is a copper-containing protein that, like plastoquinol, is a mobile electron carrier.
Fill in the blank(s) with the appropriate word(s).
Plastocyanin
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Rings of cartilage provide strength and support to keep what structure open?
a. alveoli b. larynx c. trachea d. pharynx
What discovery by T. H. Morgan finally determined that genes were carried on chromosomes?
A. the finding of complete dominance B. discovery of the Rh blood group C. sex-linked inheritance of eye color in fruit flies D. heat-sensitivity of certain enzymes determining coat color
The iron-sulfur world hypothesis suggests that organic molecules formed near:a
volcanoes. b. sulfur pools. c. pools of water. d. hydrothermal vents. e. low atmosphere clouds
Why did the smooth muscle in cultured strips of aorta not respond to acetylcholine by relaxing, while the smooth muscle of aortic rings did?
a) The endothelial layer in aortal strips was abnormally thickened, while in aortal rings it was not. b) Acetylcholine in the strips could not penetrate to the muscle cells while in the rings it could. c) Smooth muscle cells in aortic strips are physically incapable of relaxing under any circumstances. d) The delicate endothelial layer in aortal strips had been rubbed away during dissection, while in aortal rings it remained intact. e) Smooth muscle cells in aortic rings express acetylcholine receptors, while those in strips do not.