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What is the first step in the payoff phase of glycolysis?

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What is the first step in the payoff phase of glycolysis?

(a) Reduction of 1, 3-bisphosphoglycerate to glyceraldehyde 3-phosphate

(b) Oxidation of glyceraldehyde 3-phosphate to 1, 3-bisphosphoglycerate

(c) Reversible conversion of dihydroxyacetone phosphate to glyceraldehyde 3-phosphate

(d) Irreversible conversion of dihydroxyacetone phosphate to glyceraldehyde 3-phosphate

I had been asked this question in an online quiz.

My question is based upon Glycolysis in section Principles of Bioenergetics and Glycolysis of Biochemistry

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Right choice is (b) Oxidation of glyceraldehyde 3-phosphate to 1, 3-bisphosphoglycerate

The explanation is: Glyceraldehyde 3-phosphate dehydrogenase catalyzes the first step in the payoff phase, oxidation of glyceraldehyde 3-phosphate to 1, 3-bisphosphoglycerate.

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