Question:
During glycolysis, both oxidation and phosphorylation reactions occur during conversion of ______.
During glycolysis, both oxidation and phosphorylation reactions occur during conversion of ______.
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The only oxidation step in glycolysis is conversion of PGAL to 1,3-bisphosphoglycerate.
Updated On: Feb 4, 2026
- PEP to Pyruvate
- 2-PGA to PEP
- DHAP to PGAL
- PGAL to 1,3-di PGA
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the glycolytic step.
In glycolysis, glyceraldehyde-3-phosphate (PGAL) is oxidized and simultaneously phosphorylated to form 1,3-bisphosphoglycerate.
Step 2: Evaluating the options.
(A) PEP to Pyruvate: Incorrect. Only phosphorylation occurs.
(B) 2-PGA to PEP: Incorrect. This involves dehydration.
(C) DHAP to PGAL: Incorrect. This is an isomerization reaction.
(D) PGAL to 1,3-di PGA: Correct. Both oxidation and phosphorylation occur in this step.
Step 3: Conclusion.
The correct answer is (D) PGAL to 1,3-di PGA.
In glycolysis, glyceraldehyde-3-phosphate (PGAL) is oxidized and simultaneously phosphorylated to form 1,3-bisphosphoglycerate.
Step 2: Evaluating the options.
(A) PEP to Pyruvate: Incorrect. Only phosphorylation occurs.
(B) 2-PGA to PEP: Incorrect. This involves dehydration.
(C) DHAP to PGAL: Incorrect. This is an isomerization reaction.
(D) PGAL to 1,3-di PGA: Correct. Both oxidation and phosphorylation occur in this step.
Step 3: Conclusion.
The correct answer is (D) PGAL to 1,3-di PGA.
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