Biology 9700 · AS & A Level · Factors that affect enzyme action

Factors that affect enzyme action — practice question

The influence of substrate concentration on an enzyme-catalysed reaction was investigated under three separate conditions: • no inhibitor was present • a competitive inhibitor was present • a non-competitive inhibitor was present. The results are shown in the graph. Which row is correct?

  • Awithout an inhibitor: 1; with a competitive inhibitor: 2; with a non-competitive inhibitor: 3
  • Bwithout an inhibitor: 1; with a competitive inhibitor: 3; with a non-competitive inhibitor: 2
  • Cwithout an inhibitor: 3; with a competitive inhibitor: 1; with a non-competitive inhibitor: 2
  • Dwithout an inhibitor: 3; with a competitive inhibitor: 2; with a non-competitive inhibitor: 1

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