Exemplar Problems

Question:

How do factors such as temperature, pH, and substrate concentration affect enzyme activity? Provide examples.

Answer:

Enzyme activity is influenced by various factors:

• Temperature: Enzymes have optimal temperature ranges, and deviations from this range can denature the enzyme. For example, most human enzymes have optimal temperatures near body temperature (37°C).

• pH: Enzymes have optimal pH values. Extreme pH levels can disrupt enzyme structure. For instance, pepsin in the stomach functions optimally at a low pH.

• Substrate Concentration: Initially, increasing substrate concentration enhances enzyme activity until saturation occurs. As an example, increasing substrate concentration for the enzyme amylase accelerates starch digestion until all amylase active sites are occupied.