Question

mini-quiz: temperature and enzymes
why does the reaction rate slow down drastically when the temperature is too high?
a. the enzyme loses its shape (denatures) and can no longer effectively catalyze the reaction.
b. the substrates are moving too fast for the enzyme.
c. the enzyme loses its color and attractiveness, rendering it useless.
d. the enzyme and substrate get stuck together and cannot separate, resulting in a slower reaction.
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Explanation:

To determine the correct answer, we analyze each option:

• Option A: Enzymes are proteins with specific 3D structures (including the active site). High temperature causes enzymes to denature (lose their specific shape), including the active site. Without a properly shaped active site, the enzyme can't effectively bind to the substrate and catalyze the reaction, so the reaction rate drops. This aligns with biological principles about enzyme function and temperature effects.
• Option B: Higher temperature increases substrate movement, which usually increases reaction rate (more collisions), not slow it down. So this is incorrect.
• Option C: Enzyme function is not related to color or attractiveness. This is a nonsensical explanation.
• Option D: Enzymes and substrates don't "get stuck together" in a way that slows the reaction. Enzymes are catalysts that facilitate reactions and can be reused; they don't permanently bind to substrates in a way that would cause a slowdown.

Answer:

A. The enzyme loses its shape (denatures) and can no longer effectively catalyze the reaction.