What does tertiary structure of a protein indicate ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Protein Structure**: Proteins have multiple levels of structure: primary, secondary, tertiary, and quaternary. Each level of structure is crucial for the protein's overall function.

2. **Primary Structure**: The primary structure of a protein refers to the linear sequence of amino acids. This sequence is unique for each protein and determines its identity.

3. **Secondary Structure**: The secondary structure involves the folding of the primary structure into shapes such as alpha helices and beta sheets due to hydrogen bonding between the amino acids.

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