Substrate level phosphorylation occurs during which step of Krebs' cycle?

S u c c i n y l C o A \to S u c c i n i c a c i d

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I s o c i t r i c a c i d \to O x a l o s u c c i n i c a c i d

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O x a l o s u c c i n i c a c i d \to α - k e t o g l u t a r i c a c i d

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M a l i c a c i d \to O A A

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Solution

The correct option is A $S u c c i n y l C o A \to S u c c i n i c a c i d$
During Krebs' or citric acid cycle, succinyl-CoA is acted upon by enzyme succinyl-CoA synthetase to form succinate (a 4C compound). The reaction releases sufficient energy to form ATP (in plants) or GTP (in animals) by substrate-level phosphorylation. GTP can form ATP through a coupled reaction.
$S u c c i n y l C o A + G D P / A D P + H_{3} {P O}_{4} S u c c i n y l C o A ⇌ s y n t h e t a s e S u c c i n a t e + C o A + G T P / A T P$

So the correct answer is ' $S u c c i n y l C o A \to S u c c i n i c a c i d$ '.

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