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The monomers of proteins are amino acids. 
A dipeptide is formed when two amino acids join together.
A polypeptide is formed when more than two amino acids join together.
Proteins are made up off one or more polypeptides.
All amino acids have the same general structure - a carboxylate group (COOH) and an amino group (NH2) attached to a carbon atom.
The difference between different amino acids is the variable group (R on diagram).
            H2N - C - COOH
Amino acids are linked together by condensation reactions to form polypeptides.
A molecule of water is released during the reaction.
The bonds formed between amino acids are called peptide bonds.
The reverse reaction is hydrolysis, this happens during digestion.

The structure of proteins are in four levels:
Primary structure - this is the sequence of amino acids in…


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