A cation that often acts as a cofactor for enzymes is
A) sodium.
B) potassium.
C) calcium.
D) magnesium.
E) zinc.
D
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On a long transcontinental flight, a middle-aged man gets up and exercises in the aisle,
moving his hands, feet, arms, and legs as much as he can. He does this every two hours. The flight attendant asks him to sit down, but he explains that he is trying to prevent a very dangerous medical condition. He is talking about A) deep vein thrombosis. B) leukemia. C) aplastic anemia. D) thrombocytopenia.
The muscle that causes the look of fear by tensing the skin of the neck is the
A. zygomaticus major. B. platysma. C. buccinator. D. orbicularis oculi. E. orbicularis oris.
Thymine is replaced by which nitrogen base in RNA?
A) ribose B) uracil C) guanine D) thymine is not replaced in RNA E) cytosine
The popliteal region is best seen from a(n) ________ view.
A. anterior ?B. lateral ?C. superior ?D. inferior ?E. posterior