At high temperature, the enzymes stop functioning

Explanation

### Step-by-Step Solution:

1. **Understanding Enzymes**: Enzymes are biological catalysts that speed up chemical reactions in living organisms. They are primarily made up of proteins.

2. **Nature of Proteins**: Enzymes are composed of long chains of amino acids, which fold into specific three-dimensional shapes. This structure is crucial for their function.

3. **Effect of High Temperature**: When enzymes are exposed to high temperatures, the heat can disrupt the bonds that hold the protein structure together. This process is known as denaturation.

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