Question

Ratio of ATP:NADH:FADH2 produced in Krebs' cycle per one acetyl Co-A molecule by substrate level phosphorylation is:

• A. 2 : 3 : 2
• B. 1 : 9 : 2
• C. 2 : 9 : 2
• D. 2 : 2 : 9

Hint:

Understanding the output of the Krebs' cycle is crucial for comprehending the overall energy yield of cellular respiration, especially how glucose is fully oxidized to harness energy.

Answer 1

The Correct Option is B

In the Krebs cycle, for each molecule of acetyl Co-A, the following products are generated:
ATP: 1 ATP is produced directly via substrate-level phosphorylation (from the conversion of succinyl-CoA to succinate).
NADH: 3 NADH molecules are produced (from NAD+ reduction during three steps of the cycle).
FADH2: 1 FADH2 is produced (from the reduction of FAD during the conversion of succinate to fumarate).