Question

3) Which of the following are the reasons why FADH2 produce less ATP compared to NADH? (3 points) I) Because it has lower oxidation potential compared to NADH II) Because it has lower reduction potential compared to NADH III) Because formation of FAD+ requires energy input IV) It pumps less number of H+ required for generation a) I and III b) III and IV c) I and IV d) II and IV

Answer 1

NADH produces 3 ATP.

FADH2 produces 2 ATP.

FADH2 activates only 2 proton pumps while NADH activates 3 proton pumps. So, IV is correct.

Redox potential of NADH= -0.320

Redox potential of FADH2 = 0.031

So, FADH2 has lower oxidation potential. Hence, I is also correct.

So ans is c). I and IV.