The exact sequence of amino acids in a polypeptide chain is called the protein's
- A. secondary structure
- B. tertiary structure
- C. quaternary structure
- D. primary structure
Explanation
Primary structure is simply the amino acid order, dictated by the gene. It determines how the chain folds into secondary and tertiary shapes, so a single substitution can wreck the protein's function. Quaternary structure only exists when several chains assemble together.
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