The respiratory quotient (RQ) is the ratio of the volume of carbon dioxide produced to the volume of oxygen consumed during a metabolic process. It indicates the type of fuel being metabolized by an organism. The RQ value varies depending on the substrate being oxidized. The respiratory quotient of glucose is approximately 1. This means that when glucose is fully oxidized in the presence of oxygen, one molecule of glucose produces approximately one molecule of carbon dioxide and consumes one molecule of oxygen. Therefore, the correct option is (A) 1.
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