Question:
Identify the step, in which phosphorylation occurs with the help of inorganic phosphate and not ATP.
Identify the step, in which phosphorylation occurs with the help of inorganic phosphate and not ATP.
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Look for the oxidation step in which inorganic phosphate is added while NAD is reduced.
Updated On: Nov 12, 2026
- Glucose (6C) 1M \(\rightarrow\) Glucose -6- phosphate (6C) 1M
- Glyceraldehyde-3-phosphate (3C) \(\rightarrow\) 1,3 bisphosphoglycerate (3C)
- 2 Phosphoenol pyruvate (3C) \(\rightarrow\) Pyruvic acid (3C)
- 1,3 bisphosphoglycerate (3C) \(\rightarrow\) 3 Phosphoglycerate (3C)
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Some glycolytic steps use ATP as the phosphate donor, some give phosphate to ADP, and one uses free inorganic phosphate.
Step 2: Check each step
Glucose to glucose-6-phosphate takes phosphate from ATP.\n1,3-bisphosphoglycerate to 3-phosphoglycerate and phosphoenol pyruvate to pyruvate give phosphate to ADP.
Step 3: Identify the step
When glyceraldehyde-3-phosphate is oxidised by its dehydrogenase, NAD is reduced and inorganic phosphate is attached to form 1,3-bisphosphoglycerate.
Final Answer:
Glyceraldehyde-3-phosphate to 1,3 bisphosphoglycerate uses inorganic phosphate. \[ \boxed{\text{(B) }\text{Glyceraldehyde-3-phosphate (3C)} \rightarrow \text{1,3 bisphosphoglycerate (3C)}} \]
Some glycolytic steps use ATP as the phosphate donor, some give phosphate to ADP, and one uses free inorganic phosphate.
Step 2: Check each step
Glucose to glucose-6-phosphate takes phosphate from ATP.\n1,3-bisphosphoglycerate to 3-phosphoglycerate and phosphoenol pyruvate to pyruvate give phosphate to ADP.
Step 3: Identify the step
When glyceraldehyde-3-phosphate is oxidised by its dehydrogenase, NAD is reduced and inorganic phosphate is attached to form 1,3-bisphosphoglycerate.
Final Answer:
Glyceraldehyde-3-phosphate to 1,3 bisphosphoglycerate uses inorganic phosphate. \[ \boxed{\text{(B) }\text{Glyceraldehyde-3-phosphate (3C)} \rightarrow \text{1,3 bisphosphoglycerate (3C)}} \]
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