What happens to an enzyme at low temperature?

Explanation

**Step-by-Step Solution:**

1. **Understanding Enzymes**: Enzymes are biological catalysts that speed up chemical reactions in living organisms. They work by binding to substrates (the molecules they act upon) to facilitate the reaction.

2. **Effect of Temperature on Molecular Movement**: Temperature affects the kinetic energy of molecules. At low temperatures, the kinetic energy of both enzymes and substrates decreases, leading to reduced molecular movement.

3. **Collision Frequency**: For a reaction to occur, the enzyme and substrate must collide with each other. At low temperatures, the reduced molecular movement means that the frequency of collisions between enzymes and substrates decreases.

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