Peptide, Peptide Bond, Amino Acid Residues

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∟Peptide, Peptide Bond, Amino Acid Residues

This section provides a quick introduction of peptide, which a chain of two or more amino acid residues linked together by peptide bonds.

What Is Peptide? - A peptide is a chain of two or more amino acid residues linked together by peptide bonds. A peptide is a polymer, because it consists entirely of a number of similar units, amino acid residues, bonded together.

What Is Condensation Reaction of Amino Acids A condensation reaction of amino acids is a chemical reaction between two acid reacts. During the condensation reaction, the carboxyl group an amino acid reacts to the amino group of another amino acid to form a new covalent bond between the carbon atom and the nitrogen atom. A water molecule is formed at the same time. See the diagram below (source: philpoteducation.com):

Condensation Reaction of Two Amino Acids

What Is Peptide Bond? - A peptide bond is the covalent bond between the carbon atom and the nitrogen atom resulted from a condensation reaction between two amino acids.

What Is Amino Acid Residue? - An amino acid residue is the remaining structure of an amino acid after a condensation reaction with another amino acid.

The term "peptide" can have a prefix to refer to the number of amino acid residues in the peptide, like:

Dipeptide: consists of two amino acid residues
Tripeptide: has three amino acid residues
Tetrapeptide: has four amino acid residues
Pentapeptide: has five amino acid residues
Hexapeptide: has six amino acid residues
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