Chemically, denaturation does not change the primary structure of proteins.

Explanation

### Step-by-Step Solution:

1. **Understanding Protein Structure**:
- Proteins are made up of long chains of amino acids linked by peptide bonds, forming polypeptides. The structure of proteins can be classified into four levels: primary, secondary, tertiary, and quaternary.

2. **Defining Primary Structure**:
- The primary structure of a protein refers to the linear sequence of amino acids in a polypeptide chain. It is simply a long chain of amino acids without any folding or interactions.

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