Sagot :
One substrate level phosphorylation occur in the citric acid cycle in the reaction catalyzed by succinyl CoA synthetase. Thus,option D is correct.
What is phosphorylation?
A process in which a phosphate group is added to a molecule like protein and sugar.
The first step is a condensation step,combining the two- carbon oxaloacetate molecule to form a six- carbon molecule of citrate.
Succinyl CoA synthetase is synthesized from alpha- ketoglutarate by alpha -ketoglutarate dehydrogenase through decarboxylation.
During this process addition of phosphate to an organic compound takes place.
Addition of phosphate to glucose to produce glucose monophosphate and phosphate combined with adenosine diphosphate to form adenosine triphosphate.
The main function of phosphorylation is the regulation of cellular processes like cell cycle and cell growth.
Therefore,succinyle CoA is the substrate that catalyzes one substrate level phosphorylation citric acid cycle reaction.Thus, option D is correct.
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Question you asked seems incomplete it may be probably like this
One substrate level phosphorylation occurs in the citric acid cycle in the reaction catalyzed be?
A) isocitric acid
B) oxalosuccinic acid
C) malic acid
D) succinyl CoA