DP Biology (last assessment 2024)
Question 18M.2.HL.TZ2.4c
| Date | May 2018 | Marks available | [Maximum mark: 3] | Reference code | 18M.2.HL.TZ2.4c |
| Level | HL | Paper | 2 | Time zone | TZ2 |
| Command term | Explain | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 3]
18M.2.HL.TZ2.4c
(c)
Explain how enzymes catalyse chemical reactions.
[3]
Markscheme
a. enzymes work by forming enzyme–substrate complexes
b. binding of substrate«s» to active site «of enzyme»
c. «enzyme» changes shape slightly
OR
puts strains on chemical bonds «of substrate»
d. decreases activation energy / increases rate of reaction
e. enzymes bind to specific substrates
Can show these points in an annotated diagram.
