Question

How many points are there in the TCA cycle where NAD^+ is reduced?

(a) One

(b) Two

(c) Three

(d) Four

I had been asked this question by my school teacher while I was bunking the class.

I need to ask this question from Aerobic Respiration topic in chapter Respiration in Plants of Biology – Class 11

Answer 1

Right answer is (c) Three

For explanation I would say: There are three points in the TCA cycle where NAD^+ is reduced to NADH + H^+ and one point where FAD^+ is reduced to FADH2. In a coupled reaction GTP is converted to GDP with the simultaneous synthesis of ATP from ADP.