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(A) The respiratory substrate that yields the maximum number of $ATP$ molecules is a polysaccharide like glycogen. Glycogen is a polymer of glucose. W

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Glycogen

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(A) The respiratory substrate that yields the maximum number of $ATP$ molecules is a polysaccharide like glycogen. Glycogen is a polymer of glucose. When glycogen is broken down into glucose$-1-$phosphate and then enters the glycolytic pathway,it bypasses the initial phosphorylation step that consumes $1$ $ATP$ molecule. Therefore,the net yield of $ATP$ from the oxidation of a glucose unit derived from glycogen is slightly higher than that of free glucose. Among the given options,glycogen is the most efficient respiratory substrate for $ATP$ production.

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

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