Question

How many ATP molecules are generated when one molecule of reduced coenzyme NADH$_2$ is reoxidised during respiratory chain?

• A. Two
• B. Four
• C. One
• D. Three

Hint:

NADH$_2$ yields more ATP than FADH$_2$ during respiration.

Answer 1

The Correct Option is D

Step 1: Understanding oxidative phosphorylation.
During the respiratory chain, NADH$_2$ donates electrons that pass through electron carriers, releasing energy.
Step 2: ATP yield.
The energy released during electron transfer from one NADH$_2$ molecule is used to synthesize three ATP molecules.
Step 3: Conclusion.
Hence, one NADH$_2$ molecule generates three ATP molecules.