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Question

The most common respiratory substrate is

A
Glucose
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B
Sucrose
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C
Maltose
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D
Glycogen
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Solution

The correct option is A Glucose
The various organic substances such as carbohydrates, fats and proteins are respired completely to carbon dioxide and water are called respiratory substrates. Under natural conditions only carbohydrates are used. Glucose being the simplest monosaccharide hexose molecule acts as the chief respiratory substrate.
Thus, the correct answer is option A.

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