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 recorded under three separate conditions: • with no inhibitor • with a competitive inhibitor • with a non-competitive inhibitor. The graph illustrates the outcomes. Which statement is correct?

  • AX is a competitive inhibitor which binds to a site other than the active site of the enzyme.
  • BX is a non-competitive inhibitor which has a similar shape to the active site of the enzyme.
  • CY is a competitive inhibitor which has a similar shape to the active site of the enzyme.
  • DY is a non-competitive inhibitor which binds to a site other than the active site of the enzyme.

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