At a low temperature an enzyme works slowly because

  1. there is no substrate
  2. there are fewer effective collisions due to low kinetic energy
  3. the active site is destroyed
  4. it is denatured
Answer

B) there are fewer effective collisions due to low kinetic energy

Low kinetic energy means fewer collisions. O Level Biology · Topic 5 Enzymes · 5.2 Effects of temperature and pH

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