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  4. When proteins are respiratory substrates the respiratory ratio would be about

Q. When proteins are respiratory substrates the respiratory ratio would be about

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Solution:

The ratio of the volume of CO2 evolved to the volume of O2 consumed in respiration is called the respiratory quotient (RQ) or respiratory ratio.
When carbohydrates are used as substrate and are completely oxidised, the RQ will be 1, because equal amounts of CO2 and O2 are evolved and consumed, respectively.
When fats are used in respiration, the RQ is less than 1. In tripalmitin, it is about 0.7.
When proteins are respiratory substrates the ratio would be about 0.9.