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Respiratory substrate yielding maximum number of ATP molecule is

1. ketogenic amino acids
2. glucose
3. amylose
4. glycogen

Correct answer: glucose

Solution

Glucose is the direct respiratory substrate for glycolysis, so it can be fully oxidized without any prior breakdown cost. Larger polymers like amylose and glycogen must first be hydrolyzed to glucose, and amino acids may lose part of their carbon skeleton or require deamination, reducing net ATP yield.

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