Rahman W.

asked • 12/08/19

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

poisonous effects?

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


electron-transport chain:

a. NADH complex I CoQ Complex II CoQ complex III

complex IVCyt 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 .



1 Expert Answer

By:

Stanton D. answered • 12/10/19

Tutor to Pique Your Sciences Interest

Rahman W.

thank you for the second one I said steps 1,4 and 5 and for the last one I assume both A and D are correct, is this correct?
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12/12/19

Stanton D.

I think B only for last one, see reference https://www.google.com/imgres?imgurl=https%3A%2F%2Fwww.researchgate.net%2Fprofile%2FAris_Polyzos%2Fpublication%2F308080862%2Ffigure%2Ffig1%2FAS%3A414675511595008%401475877754695%2FSchematic-diagram-of-the-electron-transport-chain-ETC-of-mitochondria-Complex-C-I.png&imgrefurl=https%3A%2F%2Fwww.researchgate.net%2Ffigure%2FSchematic-diagram-of-the-electron-transport-chain-ETC-of-mitochondria-Complex-C-I_fig1_308080862&docid=Vc5-vZpDe5zLrM&tbnid=E-N9Pqhp-rg9DM%3A&vet=10ahUKEwiK1bL95bDmAhWNtp4KHRUdAhcQMwh4KAAwAA..i&w=850&h=674&bih=568&biw=1242&q=electron%20transport%20chain%20diagram&ved=0ahUKEwiK1bL95bDmAhWNtp4KHRUdAhcQMwh4KAAwAA&iact=mrc&uact=8 -- Cheers, -- Mr. d.
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12/12/19

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