Question

The respiratory quotient (RQ) of carbohydrate is

• A. Equal to 1
• B. Less than 1
• C. More than 1
• D. None of the above

Answer 1

The correct option is A Equal to 1

The respiratory quotient (RQ) is the ratio of CO${}_2$ produced to O${}_2$ consumed, while food is being metabolized. The carbohydrates have equal numbers of carbon and oxygen in their molecules. When carbohydrates are used as the substrate, then the RQ will be 1, because equal amounts of carbon dioxide and oxygen are evolved and consumed. So, the correct answer is option A.