A heart rate above 100 beats per minute is known as ____
a. bradycardia
b. arrhythmia
c. tachycardia
d. atrial fibrillation
e. ventricular fibrillation
ANSWER: c
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The higher order structure of chromatin contains topologically constrained loops. What would happen if a single loop was cleaved?
A. The entire chromosome would unravel. B. The genes of that loop could not be transcribed. C. Only that loop would relax because each loop is separately constrained by proteins. D. The genes in the cleaved loop could not be replicated. E. Supercoiling in the cleaved loop would not be affected.
Complement-mediated lysis is achieved by
A. entry of lysozyme into Gram-positive bacteria and entry of lysozyme into Gram-negative bacteria. B. entry of lysozyme into Gram-negative bacteria. C. entry of lysozyme into Gram-positive bacteria. D. None of the choices are correct.
The active site of an enzyme ____.
A. is where the coenzyme is located B. is a specific bulge or protuberance on an enzyme C. is a groove or crevice in the structure of the enzyme complementary to the substrate D. will react with only one substrate no matter how many molecules may resemble the shape of the substrate E. rigidly resists any alteration of its shape
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