Why does NADH donate electrons to the beginning of the electron transport chain, whereas FADH2 donates electrons to the middle of the chain?

Question

Why does NADH donate electrons to the beginning of the electron transport chain, whereas FADH2 donates electrons to the middle of the chain? (A) FADH2 is more rapidly oxidized than NADH. (B) NADH has more electrons to donate than FADH2. (C) FADH2 has more reducing potential than NADH. (D) NADH has more potential energy than FADH2.

Tardigrade Admin · Accepted Answer

Correct answer is (d) NADH has more potential energy than FADH2.

Q. Why does $N A DH$ donate electrons to the beginning of the electron transport chain, whereas $F A D H_{2}$ donates electrons to the middle of the chain?

$F A D H_{2}$ is more rapidly oxidized than $N A DH$ .

$N A DH$ has more electrons to donate than $F A D H_{2}$ .

$F A D H_{2}$ has more reducing potential than $N A DH$ .

$N A DH$ has more potential energy than $F A D H_{2}$ .

Correct answer is (d) $N A DH$ has more potential energy than $F A D H_{2}$ .

Q. Why does NADH donate electrons to the beginning of the electron transport chain, whereas FADH2​ donates electrons to the middle of the chain?

FADH2​ is more rapidly oxidized than NADH.

NADH has more electrons to donate than FADH2​.

FADH2​ has more reducing potential than NADH.

NADH has more potential energy than FADH2​.