Edexcel A-Level Biology A2 7.6 Respiratory Quotient Questions

Calculate respiratory quotient as carbon dioxide produced divided by oxygen used, then interpret RQ values to identify fat or carbohydrate substrates using marked questions.

Exam points

calculate respiratory quotient from carbon dioxide produced divided by oxygen used
interpret RQ values and changes as evidence for fat or carbohydrate substrate use

[Maximum number: 1]

Animals use aerobic and anaerobic respiration to produce ATP.

Aerobic respiration has three stages where reactions occur between enzymes and substrates.

A student calculated the volume of oxygen used by a cockroach as $1.7 \mathrm{~cm}^{3}$ hour ${ }^{-1}$ . The same cockroach produced $1.3 \mathrm{~cm}^{3}$ hour ${ }^{-1}$ of carbon dioxide in the same time.

What is the respiratory quotient (RQ) of this cockroach?

0.7

0.8

1.3

2.2

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Edexcel A-Level Biology A2 7.6 Respiratory Quotient Questions question 1