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8.3 Respiration

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Question 2

A researcher supplies glucose to cells in three microfluidic chambers.

The table shows the conditions and results in each chamber.

ChamberCellsOxygen concentration / mg dm⁻³Substances detected after respiration
Phuman muscle cellsdecreases from 8.0 to 2.1carbon dioxide
Qhuman muscle cellsremains at 0.0lactic acid
Ryeast cellsremains at 0.0ethanol and carbon dioxide

Compare the respiration taking place in chambers P, Q and R. In your answer, identify the pathway in each chamber and include which chamber would use the least glucose to transfer the same amount of energy to ATP.

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Markscheme

8.3 Respiration Questions

  1. GCSE
  2. /Biology
  3. /8.3 Respiration

98 exam-style questions on Edexcel GCSE Biology 8.3 Respiration, covering 8.3.1 Aerobic and anaerobic respiration. Each one has a worked solution and a mark scheme showing where the marks go.

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