For 4A through 4C, refer to the redox couples below. A. Cytochrome f (Fe 3+ ) /

ID: 921176 • Letter: F

Question

For 4A through 4C, refer to the redox couples below.

A. Cytochrome f (Fe3+) / Cytochrome f (Fe2+)

B. Ferredoxin (Fe3+) / Ferredoxin (Fe2+)

C. Cytochrome b (Fe3+) / Cytochrome b (Fe2+)

4A. If, under standard biochemical conditions, cytochrome b donated an electron to ferredoxin, then (select any/all answers that apply).

a. the coupled redox reaction would be exergonic.

b. the coupled redox reaction would be endergonic.

c. the coupled redox reaction would have a negative G'° value.

d. cytochrome b (Fe3+) would become reduced to cytochrome b (Fe2+) during the coupled redox reaction.

e. cytochrome b (Fe2+) would become oxidized to cytochrome b (Fe3+) during the coupled redox reaction.

4B. Which of the following species could potentially act as an electron donor? Select any/all answers that apply.

a. cytochrome b (Fe2+)

b. cytochrome b (Fe3+)

c. cytochrome f (Fe2+)

d. cytochrome f (Fe3+)

e. ferredoxin (Fe2+)

4C. Which of the following species is in an oxidized form? Select any/all answers that apply.

a. cytochrome b (Fe2+)

b. cytochrome b (Fe3+)

c. cytochrome f (Fe2+)

d. cytochrome f (Fe3+)

e. ferredoxin (Fe2+)

4A. If, under standard biochemical conditions, cytochrome b donated an electron to ferredoxin, then

c. the coupled redox reaction would have a negative G'° value.

e. cytochrome b (Fe2+) would become oxidized to cytochrome b (Fe3+) during the coupled redox reaction

4B. Of the given species, the one which would potentially act as electron donor is,

a. cytochrome b (Fe2+)

c. cytochrome f (Fe2+)

4C. The species which are in oxidized form (higher oxidation state) are,

b. cytochrome b (Fe3+)

d. cytochrome f (Fe3+)

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