A: Four ATP molecules are produced directly d | vedclass

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(D) In glycolysis,$4$ $ATP$ molecules are produced by substrate-level phosphorylation,but $2$ $ATP$ molecules are consumed during the preparatory phas

Vedclass · Accepted Answer

Both Assertion and Reason are incorrect.

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(D) In glycolysis,$4$ $ATP$ molecules are produced by substrate-level phosphorylation,but $2$ $ATP$ molecules are consumed during the preparatory phase. Thus,the net gain is $2$ $ATP$. The statement that $4$ $ATP$ are produced 'directly' is often interpreted as the gross yield,but in the context of standard biological questions,the assertion is considered incorrect because the net yield is $2$ $ATP$. Regarding the Reason,substrate-level phosphorylation in the mitochondrial matrix occurs during the Krebs cycle (Citric Acid Cycle) at only one step: the conversion of succinyl-$CoA$ to succinate. Therefore,the Reason is also incorrect.

$A$: Four $ATP$ molecules are produced directly during glycolysis.
$R$: Substrate level phosphorylation occurs at two steps for a glucose broken down in mitochondrial matrix.

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$A$: Four $ATP$ molecules are produced directly during glycolysis.$R$: Substrate level phosphorylation occurs at two steps for a glucose broken down in mitochondrial matrix.