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Question

Krebs cycle is

A
Oxidation of glucose to alcohol and water
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B
Oxidation of acetyl CoA to carbon dioxide and water involving electron transport
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C
Complete oxidation of acetyl CoA without electron transport
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D
Complete reduction of acetyl CoA to carbon doxide and water.
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Solution

The correct option is D Complete oxidation of acetyl CoA without electron transport
The hydroxyethyl group of pyruvate is oxidized to an acetyl group and the enzyme-bound acetyl group is transferred to CoA forming acetyl CoA. During the Krebs cycle, electrons are removed from acetyl CoA and these electrons reduce more NAD+, along with another electron carrier, FAD.
So the correct option is 'Complete oxidation of acetyl CoA without electron transport'.

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