Question

During glycolysis, both oxidation and phosphorylation reactions occur during conversion of ______.

• A. PEP to Pyruvate
• B. 2-PGA to PEP
• C. DHAP to PGAL
• D. PGAL to 1,3-di PGA

Hint:

The only oxidation step in glycolysis is conversion of PGAL to 1,3-bisphosphoglycerate.

Answer 1

The Correct Option is D

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.