2023 · Q22
The rate of an enzyme catalyzed reaction depends:
general-sciencebiology-human-body
- Aupon substrate concentration, temperature and pH.
- Bonly on substrate concentration and pH, but not on temperature.
- Conly on pH and temperature, but not on substrate concentration.
- Donly on temperature, but not on pH and substrate concentration.
Explanation
The rate of an enzyme-catalysed reaction rises with substrate concentration until the enzyme is saturated (Michaelis-Menten kinetics), increases with temperature up to an optimum before denaturation sets in, and depends on pH because ionisation of the active site and substrate changes with acidity. All three factors therefore govern the reaction rate, so option A is correct.