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A: Four ATP molecules are produced directly during glycolysis.
R: Substrate level phosphorylation occurs at two steps for glucose broken down in the mitochondrial matrix.
  • a)
    If both Assertion & Reason are true, and the reason is the correct explanation of the assertion.
  • b)
    If both Assertion & Reason are true, but the reason is not the correct explanation of the assertion.
  • c)
    If the Assertion is a true statement, but Reason is false.
  • d)
    If both Assertion and Reason are false statements.
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A: Four ATP molecules are produced directly during glycolysis.R: Subst...
Substrate level phosphorylation occurs during the Kreb cycle at one step only.
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A: Four ATP molecules are produced directly during glycolysis.R: Subst...
Assertion & Reason Explanation:

Assertion: Four ATP molecules are produced directly during glycolysis.

Reason: Substrate level phosphorylation occurs at two steps for glucose broken down in the mitochondrial matrix.

Explanation:
- Assertion Explanation: During glycolysis, which occurs in the cytoplasm of cells, two ATP molecules are produced directly in the energy payoff phase. However, a net gain of four ATP molecules is produced during glycolysis because two ATP molecules are used in the energy investment phase, resulting in a total of four ATP molecules being produced directly.
- Reason Explanation: Substrate level phosphorylation is a metabolic reaction that results in the formation of ATP by the transfer of a phosphate group from a high-energy substrate to ADP. This process occurs in the cytoplasm during glycolysis, not in the mitochondrial matrix. In the mitochondrial matrix, oxidative phosphorylation takes place, which involves the electron transport chain and ATP synthase to produce ATP from the energy stored in NADH and FADH2.
Therefore, the assertion is true as four ATP molecules are produced directly during glycolysis, but the reason is false because substrate level phosphorylation occurs in the cytoplasm during glycolysis, not in the mitochondrial matrix.
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A: Four ATP molecules are produced directly during glycolysis.R: Substrate level phosphorylation occurs at two steps for glucose broken down in the mitochondrial matrix.a)If both Assertion & Reason are true, and the reason is the correct explanation of the assertion.b)If both Assertion & Reason are true, but the reason is not the correct explanation of the assertion.c)If the Assertion is a true statement, but Reason is false.d)If both Assertion and Reason are false statements.Correct answer is option 'C'. Can you explain this answer?
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