AP Success - AP Biology Conceptual Analysis: Systems Interact - Enzymes

In a recent experiment, researchers studied the effect of temperature on the activity of the enzyme lactase. Lactase is responsible for breaking down lactose, a sugar found in milk, into glucose and galactose. The researchers observed that the rate of lactose breakdown increased as the temperature increased from 20°C to 40°C. However, beyond 40°C, the rate of lactose breakdown decreased.

Question 1

Short answer

Describe how enzymes, like lactase, interact with their substrates to facilitate chemical reactions.

Question 2

Short answer

Based on the researchers' observations, explain how temperature affects the activity of the enzyme lactase.

Question 3

Short answer

If the experiment were to be repeated at a pH of 3 instead of the normal pH of 7, predict how this might affect the activity of lactase.

Question 4

Short answer

The researchers claim that the decrease in lactase activity beyond 40°C is due to the denaturation of the enzyme. Justify this claim.

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