A competitive inhibitor affects Vmax and Km as follows:

  1. both increased
  2. both decreased
  3. Vmax decreased, Km unchanged
  4. Vmax unchanged, Km increased
Answer

D) Vmax unchanged, Km increased

More substrate overcomes it but more is needed for ½Vmax. AS & A Level Biology · Topic 3 Enzymes · 3.2 Factors that affect enzyme action

Biology MCQ · More A Level Biology: Enzymes MCQs · Practise