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Protein Structure

The primary structure of a protein or polypeptide is the sequence of amino acids joined together by peptide bonds.This is determined by the sequence of bases in DNA.
The primary structure determines the three dimensional shape and therefore the function of the protein.
The diagram shows the four levels of protein structure.

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Specification: OCR Biology A (H020), AS-level, 2.1.2 Biological molecules. Topic: Biological Molecules.

Key terms in this lesson

peptide bond
The covalent bond formed between two amino acids by a condensation reaction.

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