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An investigation was carried out on two protease enzymes, Enzyme A and Enzyme B, to see how pH affects their rate of reaction.

A graph showing the rate of reaction for Enzyme A and Enzyme B at different pH values. The horizontal axis is pH, ranging from 1 to 12. The vertical axis is 'Rate of reaction (arbitrary units)'. Enzyme A has a curve that starts at pH 1, rises to a peak at pH 3, and falls to 0 at pH 5. Enzyme B has a curve that starts at pH 6, rises to a peak at pH 8, and falls to 0 at pH 10.

a.

State the optimum pH for Enzyme B.

[1]
b.

Enzyme A is found in the human stomach. Explain why Enzyme A is suited to working in the stomach.

[2]
c.

Complete the sentences to explain why Enzyme B does not work at pH 11. Choose words from the following list:

  • active site
  • catalyst
  • membrane
  • substrate
  • product

The part of the enzyme that changes shape is the ______.

The change in shape means the enzyme cannot bind to the ______.

[2]

2.2 Animal tissues, organs and organ systems Questions

Practise AQA GCSE Biology 2.2 Animal tissues, organs and organ systems with exam-style questions for Foundation and Higher tier. 70 questions covering 2.2.1 The human digestive system, 2.2.2 The heart and blood vessels, 2.2.3 Blood, 2.2.4 Coronary heart disease: a non-communicable disease, 2.2.5 Health issues, 2.2.6 The effect of lifestyle on some non-communicable diseases, and 2.2.7 Cancer, matched to the AQA GCSE Biology (8461) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

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2.2 Animal tissues, organs and organ systems Questions

  1. GCSE
  2. /Biology
  3. /2.2 Animal tissues, organs and organ systems