The respiratory quotient of glucose is:

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(C) The correct answer is $C$. When carbohydrates like glucose are used as respiratory substrates and are completely oxidized, the Respiratory Quotien

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$1$

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(C) The correct answer is $C$. When carbohydrates like glucose are used as respiratory substrates and are completely oxidized, the Respiratory Quotient $(RQ)$ is $1$. This is because the volume of $CO_2$ evolved is equal to the volume of $O_2$ consumed during the process of aerobic respiration, as represented by the equation: $C_6H_{12}O_6 + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{Energy}$. Thus, $RQ = \frac{	ext{Volume of } CO_2 	ext{ evolved}}{	ext{Volume of } O_2 	ext{ consumed}} = \frac{6}{6} = 1$.

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