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78. According to the diagram, how many ATP
would succinate be expected to yield under
normal circumstances?
(A) 0
(B) 1
(C) 2
(D) 3
(E) 4
79. If the inhibitor rotenone is present, how many
ATP would succinate be expected to yield?
(A) 0
(B) 1
(C) 2
(D) 3
(E) 4
80. Antimycin A blocks the transfer of electrons
at the site shown in the diagram. Which of the
following occurs if Antimycin A is present?
(A) Electron transfer proceeds normally.
(B) Electron carriers before the inhibition
site become more oxidized.
(C) Oxidation of succinate occurs completely.
(D) Electron carriers after the inhibition site
become more oxidized.
(E) Succinate would yield only 1 ATP, while
ascorbate would yield 2 ATP.

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Biology E/M Subject Test
263
ARCO
■ SAT II Subject Tests
w w w . p e t e r s o n s . c o m / a r c o
81. The interrupted line at –90 millivolts most
likely represents the
(A) resting membrane potential
(B) threshold potential
(C) inhibitory potential
(D) refractory period
(E) hyperpolarization potential
82. The threshold potential for this nerve is most
likely
(A) +80 millivolts
(B) +20 millivolts
(C) –56 millivolts
(D) –70 millivolts
(E) –90 millivolts
83. Rapid depolarization of the membrane, as
occurs in the area labeled 2, is due to which
of the following?
(A) Influx of K
+
ions
(B) Efflux of Ca
2+
ions
(C) Influx of SO
4
2–