Answer the question using the accompanying figure. At which point in this action potential diagram does the onset of
Na+ channel inactivation stop the inward flow of Na+?
a. A
b. B
c. C
d. D
e. E
ANSWER: b
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An infected intravenous (IV) catheter tip grew out gram-positive cocci, which were catalase positive and coagulase negative. The zone size of the novobiocin disk measured 18 mm. The most likely organism causing infection is:
a. S. saprophyticus. b. S. epidermidis. c. S. hominis. d. S. cohnii.
The protein located in muscle cells that delivers oxygen directly to the mitochondria is
A. Hemoglobin B. Myoglobin C. Thyroxin D. Phytic acid
Each of the following complexes pumps protons out of the matrix to generate the proton gradient except
A) complex I. B) complex II. C) complex III. D) complex IV. E) coenzyme Q.
The large amount of yolk in birds' eggs results in
A. incomplete cleavage B. complete cleavage C. fewer, smaller cells in vegetal pole D. a blastocyst