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Edexcel A-Level Biology A2 7.6 Respiratory Quotient Questions

Practise respiratory quotient by calculating CO2 produced against O2 used and linking RQ values to fat or carbohydrate substrates.

Syllabus
First assessment 2019
Course
Biology YBI11
Level
A2

Exam points

  • calculate RQ from carbon dioxide produced divided by oxygen used in tables or investigations
  • interpret a falling RQ as a shift towards lipid or fat use during respiration

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

[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 cm31.7 \mathrm{~cm}^{3} hour −1{ }^{-1}. The same cockroach produced 1.3 cm31.3 \mathrm{~cm}^{3} hour −1{ }^{-1} of carbon dioxide in the same time.

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

A

0.7

B

0.8

C

1.3

D

2.2

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