Question

ATP molecules in glycolysis are synthesized by,(a) oxidative phosphorylaton
(b) substrate level phosphorylation(c) photophosphorylation
(d) none of the above

Answer 1

Answer: none of the above

Explanation:

In glycolysis, ATP molecules are synthesized during conversion of 1,3-di PGA to 3-PGA and during conversion of PEPA into pyruvate.

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Answer 2

Answer:

The right answer is (b) substrate level phosphorylation.

Explanation:

• ATP is a form of energy that is formed in the process of glycolysis.
• By the substrate-level phosphorylation (SLP)  process ATP is directly formed and indirectly it is formed by the process of oxidative phosphorylation (OP).
• ATP molecule is used and formed in the three stages of glycolysis that are

1. Phosphorylation of glucose to glucose-6-phosphate (G6P) which requires molecules of ATP.
2. Triosephosphate (TP) production and TP oxidation from pyruvate, yield 2 reduced NAD molecules (NADH) and 4 ATP per glucose.

• In the first stage, 2 ATP molecules were used so the total net ATP gain is 2 ATP. This is substrate-level phosphorylation.
• By the process of oxidative phosphorylation, indirectly, another ATP is produced.
• Therefore the right answer is (b) substrate-level phosphorylation.