AP Biology Module 4 Vocabulary

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Last updated 1:48 AM on 8/16/26
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9 Terms

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Peptide bond

The bond between the carboxyl end of an amino acid and the amino end of another amino acid

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Peptide

A molecule made by joining amino acids together by peptide bonds. They may range from as few as two to many hundreds of amino acids linked together.

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Polypeptide

A polymer of amino acids connected by peptide bonds.

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Primary Structure

The sequence of amino acids in a peptide or a protein

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Secondary structure

The structure that results from hydrogen bonding in the polypeptide backbone. Two kinds of these are the alpha helix and the beta sheet.

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Alpha helix

The first of two principal types of secondary structure found in proteins.

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Beta sheet

The second of two principal types of secondary structure found in proteins.

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Tertiary structure

The three-dimensional shape of a single polypeptide chain, usually made up of several secondary structure elements.

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Quaternary structure

The level of protein structure that arises from the interaction of two or more polypeptide chains or subunits, each with its own tertiary structure.