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A Level Biology: Energy and respiration MCQs — Biology (page 2)

29 multiple-choice questions on A Level Biology: Energy and respiration from Biology, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.

26. In a respirometer, potassium hydroxide is used to

  1. provide oxygen
  2. absorb oxygen
  3. kill the seeds
  4. absorb carbon dioxide

Answer: D) absorb carbon dioxide

Explanation: KOH absorbs CO₂ so fluid movement shows O₂ uptake. AS & A Level Biology · Topic 12 Energy and Respiration · 12.1 Energy

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27. The cristae of mitochondria increase

  1. the size of the cell
  2. the surface area for electron carriers and ATP synthase
  3. the volume of the matrix
  4. the amount of DNA

Answer: B) the surface area for electron carriers and ATP synthase

Explanation: Folding increases membrane area. AS & A Level Biology · Topic 12 Energy and Respiration · 12.2 Respiration

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28. Dehydrogenation in the Krebs cycle

  1. adds phosphate to ADP
  2. adds water
  3. removes hydrogen used to reduce NAD and FAD
  4. removes CO₂

Answer: C) removes hydrogen used to reduce NAD and FAD

Explanation: Hydrogen goes to coenzymes. AS & A Level Biology · Topic 12 Energy and Respiration · 12.2 Respiration

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29. Chemiosmosis is

  1. splitting of glucose
  2. reduction of NAD in glycolysis
  3. ATP synthesis driven by protons diffusing through ATP synthase
  4. direct transfer of phosphate

Answer: C) ATP synthesis driven by protons diffusing through ATP synthase

Explanation: Proton gradients drive ATP synthase. AS & A Level Biology · Topic 12 Energy and Respiration · 12.1 Energy

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