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Question

The respiratory substrate yielding maximum number of ATP molecules among the following is

A
Glycogen
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B
Amylase
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C
Ketogenic amino acid
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D
Glucose
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Solution

The correct option is C Ketogenic amino acid
The metabolic fate of acetyl CoA and acetoacetate is the production of fatty acids or ketone bodies. Amino acids that are metabolized to produce acetyl CoA and acetoacetate are called ketogenic. The fatty acids produce ketone bodies, so they are called ketogenic. Both the glycerol and fatty acid portion of triglycerides can provide energy, fatty acids are the most concentrated source. Fatty acids break down into two carbon fragments to be converted into acetyl CoA. When fatty acids are converted to acetyl CoA, the action is irreversible and they are committed to enter the TCA cycle.

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