How does an enzyme speed up a reaction?
Answer and explanation
Correct answer: A. It lowers the activation energy
An enzyme provides a lower-energy path for the reaction by binding the substrate at its active site.
Answer: It lowers the activation energy.
Why not the others: It supplies heat to the reaction: enzymes do not supply energy. It is used up in the reaction: enzymes are not used up. It increases the amount of substrate: enzymes do not create substrate.
Answer: It lowers the activation energy.
Why not the others: It supplies heat to the reaction: enzymes do not supply energy. It is used up in the reaction: enzymes are not used up. It increases the amount of substrate: enzymes do not create substrate.
Practise more Cells and Molecules of Life.
Free questions with an explanation for every one, and full timed HKDSE (Hong Kong) mock tests.
More Cells and Molecules of Life questions
- Which organelle is the main site of aerobic respiration in a cell?
- Which structure is found in plant cells but not in animal cells?
- What is the monomer of a protein?
- Benedict's solution is heated with a sample and turns brick-red. What does this show?
- What happens to most enzymes at a temperature well above their optimum?
- Red blood cells placed in distilled water swell and burst. This is because water enters them by