MHT CET · BIOLOGY · STD 11 - 13. Respiration and Energy Transfer

Number of ATP molecules formed in glycolysis by substrate level phosphorylation is ____.

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Answer & Solution

Correct Answer

(B) 4

Step-by-step Solution

Detailed explanation

In the energy payoff phase, the following steps occur to generate ATP molecules through substrate-level phosphorylation: Step 7: 1,3-bisphosphoglycerate is converted to 3-phosphoglycerate, producing two ATP molecules. Step 10: Phosphoenolpyruvate (PEP) is converted to pyruvate, producing two more ATP molecules. Therefore, a total of four ATP molecules are formed by substrate-level phosphorylation during glycolysis.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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