MC Questions BioChem
Hello, any help is appreciated,
A botanist has discovered that the buds of a species of flower have an intense
citrus flavor, but act as a deadly poison when consumed by humans. Which
biochemical mechanism explains both the accumulation of citrate and the
a. Cyanide is concentrated in the plant leading to the shut down of the
electron transport chain when it is consumed.
b. The plant produces a high concentration of tryptophan which causes a
negative feedback inhibition of the citric acid cycle when consumed.
c. Arsenite is concentrated in the plant leading to the inactivation of PDH
and thus the citric acid cycle when it is consumed.
d. Fluoroacetate is produced by the plant causing the inhibition of aconitase,
leading to the shut down of the citric acid cycle when consumed.
e. Malonate is concentrated in the plant leading to the inhibition of succinate
dehydrogenase, causing the shut down of the citric acid cycle.
Which steps (enzymes) in the citric acid cycle are
regulated allosterically by high ADP?
a. 1 and 3
b. 2 and 5
c. 1 and 4
d. 1, 4, 5, 7, and 9
e. 1, 4, and 5
Choose the correct path taken by a pair of electrons as it travels down the
a. NADH → complex I → CoQ →Complex II →CoQ → complex III →
complex IV→Cyt c→ O 2 .
b. FADH2 →complex II → CoQ → Complex III →Cyt c →complex IV →
O 2 .
c. NADH → complex II→ CoQ → Complex III → Cyt c → complex IV →
O 2 .
d. FADH2 →complex II→ Cyt c → Complex III →CoQ → complex IV →
O 2 .
e. NADH → complex I → CoQ → Complex II → Cyt c→ Complex III →
Cyt c complex IV → O 2 .