Question
Different substrates get oxidized during respiration. How does Respiratory Quotient (RQ) indicate which type of substrate, i.e., carbohydrate, fat or protein is getting oxidized?
$\text{R}.\text{Q}=\frac{\text{A}}{\text{B}}$
What do A and B stand for?
What type of substrates have R.Q. of 1, < 1 or > 1?

Answer

The ratio of CO2 evolved and consumption of O2  in respiration is called the Respiratory Quotient (RQ) or respiratory ratio.
$\text{R}.\text{Q}=\frac{\text{A}}{\text{B}}=\frac{\text{Volume of}\ \text{CO}_2\text{Evolved}}{\text{Volume of}\ \text{O}_2\text{Consumed}}$
Substrates like carbohydrates have RQ =1 during, aerobic respiration. Proteins and fats have RQ of < 1 and it occurs during germination of seeds. Substrates like organic acids have RQ of > 1 under aerobic conditions.

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