Correct option is C
Correct Answer: C. Three ATP
NADH (Nicotinamide Adenine Dinucleotide) is a high-energy electron carrier produced in processes like glycolysis and the Krebs cycle.
During oxidative phosphorylation in the electron transport system (ETS), one NADH donates electrons, which flow through complexes I–IV in the mitochondrial inner membrane.
This electron flow powers proton pumping, creating a proton gradient used by ATP synthase to generate ATP.
Each NADH typically results in the production of 3 ATP molecules (although some texts now estimate ~2.5 ATP due to revised P/O ratios based on newer biochemistry findings).
FADH₂, another electron carrier, yields 2 ATP (or approximately 1.5 ATP in modern estimates).
This ATP production occurs during aerobic respiration, specifically in the inner mitochondrial membrane.
The total ATP yield from 1 glucose molecule is about 36–38 ATP in traditional texts, including ATP from glycolysis, Krebs cycle, and ETS.
Revised ATP yield (based on updated biochemistry):
1 NADH ≈ 2.5 ATP
1 FADH₂ ≈ 1.5 ATP
English
100 Questions
100 Marks
120 Mins
