Question

1. what effect does the change have on the chemical react

a. the enzyme could no longer bind to the products

b. the enzyme could no longer bind to the substrates

c. the chemical reaction carried on at the same rate

d. the enzyme worked at a slower rate

Explanation:

To solve this, we analyze each option:

• Option a: Enzymes bind to substrates (not products) to catalyze reactions, so this is incorrect.
• Option b: If a change (like denaturation, pH/temperature shift) affects the enzyme's active site, it can no longer bind to substrates. This is a key concept in enzyme function (lock - and - key or induced - fit model).
• Option c: A change affecting the enzyme would likely alter the reaction rate, so the reaction can't stay at the same rate. Incorrect.
• Option d: While a change could make the enzyme work slower, the most direct and common effect of a change (e.g., denaturation) is loss of substrate binding, not just slower rate. So b is more accurate.

Answer:

b. the enzyme could no longer bind to the substrates