BI-151
Effect of temperature and pH on enzymes
Biology · Secondary 3 · Hard · Effect of temperature and pH on enzymes
The graph shows how the rate of an enzyme‑catalysed reaction changes with temperature.
The rate increases from 10 °C to 37 °C, then decreases sharply from 37 °C to 60 °C.
Which statement explains the decrease in rate above 37 °C?
The rate increases from 10 °C to 37 °C, then decreases sharply from 37 °C to 60 °C.
Which statement explains the decrease in rate above 37 °C?
- Substrate molecules stop moving at high temperature.
- The enzyme becomes denatured and its active site changes shape.
- The enzyme is used up in the reaction.
- The activation energy of the reaction increases at low temperature only.
Sign in to check your answer and see the hint and the worked explanation. Free on PrepLab High.