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1.3 Respiration

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Question 2

A pilot plant uses yeast to produce ethanol from glucose under anaerobic conditions.

A technician obtains these preliminary results using equal volumes of the same yeast suspension and glucose solution.

Temperature / ∘C^\circ\text{C}∘CMean volume of carbon dioxide collected in 6 minutes / cm3\text{cm}^3cm3
3512.4
4521.6
554.2

Plan a follow-up investigation to:

  • estimate the optimum temperature for anaerobic respiration more precisely
  • test whether exposure to 55 ∘C55\ ^\circ\text{C}55 ∘C permanently denatures enzymes in the yeast.

Explain how the results would be used to reach both conclusions.

[6]
Markscheme

1.3 Respiration Questions

  1. GCSE
  2. /Biology
  3. /1.3 Respiration

113 exam-style questions on OCR GCSE Biology 1.3 Respiration, covering 1.3.1 Cellular respiration supplies ATP, 1.3.2 Aerobic and anaerobic respiration, 1.3.3 Sugars and carbohydrates, 1.3.4 Amino acids and proteins, and 1.3.5 Fatty acids and lipids. Each one has a worked solution and a mark scheme showing where the marks go.

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