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Question

Krebs cycle begins with the reaction

A
OAA + Acetyl CoA
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B
Citric acid + Acetyl CoA
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C
OAA + Pyruvic acid
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D
OAA + Citric acid
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Solution

The correct option is A OAA + Acetyl CoA
Krebs' cycle is a part of cellular respiration in which the end product acts as a substrate for the next cycle to begin. Oxaloacetic acid, the end product of the cycle again enters the cycle by reacting with acetyl CoA to form citric acid. It releases CoA and the cycle starts with this reaction.
So the answer is 'OAA + Acetyl CoA'.

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