A: Four ATP molecules are produced directly d | vedclass

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Question

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

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Both Assertion and Reason are incorrect.

Vedclass · Answer

(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.

Column $I$	Column $II$
$a.$ Fructose $1,6$-diphosphate $\rightarrow$ $3$-$PGAL$ + $DHAP$	$i.$ Enolase
$b.$ Citrate $\rightarrow$ $CIS$-aconitate	$ii.$ Thiokinase
$c.$ Succinyl $CoA$ $\rightarrow$ Succinate	$iii.$ Aconitase
$d.$ $2$-$PGA$ $\rightarrow$ $PEP$	$iv.$ Aldolase

Column $X$	Column $Y$
$(1)$ Mitochondrial matrix	$(P)$ Photophosphorylation
$(2)$ Chloroplast stroma	$(Q)$ Oxidative phosphorylation
$(3)$ Cristae	$(R)$ Krebs cycle
$(4)$ Granum	$(S)$ Dark reaction

$A$: 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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Select the correct match for $X$ and $Y$:
Column $X$ Column $Y$
$(1)$ Mitochondrial matrix $(P)$ Photophosphorylation
$(2)$ Chloroplast stroma $(Q)$ Oxidative phosphorylation
$(3)$ Cristae $(R)$ Krebs cycle
$(4)$ Granum $(S)$ Dark reaction

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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.