Question:
Total number of ATP molecules formed by substrate level phosphorylation in complete oxidation of one glucose molecule are ___________.
Total number of ATP molecules formed by substrate level phosphorylation in complete oxidation of one glucose molecule are ___________.
Show Hint
Count ATP formed directly in glycolysis and the Krebs cycle for one glucose.
Updated On: Nov 13, 2026
2
4
6
8
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
Substrate level phosphorylation forms ATP directly from a substrate, without the electron transport chain.
Step 2: Glycolysis
Glycolysis gives 4 ATP (gross) by substrate level phosphorylation.
Step 3: Krebs cycle
Two turns of the cycle give 2 GTP (equal to ATP) at the succinyl CoA step.
Step 4: Compare the options
Total \(= 4 + 2 = 6\) ATP.
Final Answer:
Six ATP are formed by substrate level phosphorylation. \[ \boxed{\text{(C) }6} \]
Substrate level phosphorylation forms ATP directly from a substrate, without the electron transport chain.
Step 2: Glycolysis
Glycolysis gives 4 ATP (gross) by substrate level phosphorylation.
Step 3: Krebs cycle
Two turns of the cycle give 2 GTP (equal to ATP) at the succinyl CoA step.
Step 4: Compare the options
Total \(= 4 + 2 = 6\) ATP.
Final Answer:
Six ATP are formed by substrate level phosphorylation. \[ \boxed{\text{(C) }6} \]
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