Question:
During glycolysis, which one of the following intermediates undergoes oxidation as well as phosphorylation?
During glycolysis, which one of the following intermediates undergoes oxidation as well as phosphorylation?
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Glyceraldehyde 3-phosphate is oxidised and takes up inorganic phosphate in the same step.
Updated On: Nov 12, 2026
- 3-PGAL
- Fructose-1,6-diphosphate
- 2-PGA
- 3-PGA
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept
In glycolysis one step involves both oxidation (loss of hydrogen) and phosphorylation (addition of phosphate).
Step 2: The step
3-phosphoglyceraldehyde (3-PGAL) is acted on by glyceraldehyde-3-phosphate dehydrogenase.
It loses hydrogen to \(\text{NAD}^{+}\), giving NADH, and takes up inorganic phosphate.
Step 3: Result
The product is 1,3-bisphosphoglyceric acid.
The other listed intermediates do not undergo both changes together.
Final Answer:
3-PGAL is both oxidised and phosphorylated. \[ \boxed{\text{(A) }\text{3-PGAL}} \]
In glycolysis one step involves both oxidation (loss of hydrogen) and phosphorylation (addition of phosphate).
Step 2: The step
3-phosphoglyceraldehyde (3-PGAL) is acted on by glyceraldehyde-3-phosphate dehydrogenase.
It loses hydrogen to \(\text{NAD}^{+}\), giving NADH, and takes up inorganic phosphate.
Step 3: Result
The product is 1,3-bisphosphoglyceric acid.
The other listed intermediates do not undergo both changes together.
Final Answer:
3-PGAL is both oxidised and phosphorylated. \[ \boxed{\text{(A) }\text{3-PGAL}} \]
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