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: • without inhibitor • with inhibitor X • with inhibitor Y. The graph presents the data. Which statement is correct?

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

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