If RQ is greater than 1 in a respiratory metabolism, what would be the respiratory substrate?
A
Organic acids
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B
Proteins
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C
Carbohydrates
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D
Fats
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Solution
The correct option is A Organic acids Respiratory quotient (RQ) is the ratio of the volume of carbon dioxide given out to the volume of oxygen absorbed in respiration. The RQ value is greater than one when organic acid like malic acid is consumed in respiration, as the volume of CO2 evolved is more than the volume of O2 consumed. C4H6O5 + 3O2 →4CO2 + 3H2O
Malic acid
RQ= 4CO2/3O2 = 1.33