A catalyst

  1. is used up in the reaction
  2. speeds up a reaction and is not changed by it
  3. is always a carbohydrate
  4. slows down a reaction
Answer

B) speeds up a reaction and is not changed by it

Definition of a catalyst. O Level Biology · Topic 5 Enzymes · 5.1 Enzyme action

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