Many proteins are immense

Many proteins are immense - Each amino acid has an amino...

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Many proteins are immense in size and extremely complex.  However, all proteins are composed of long chains of relatively simple  amino acids.  There are 20 kinds of amino acids. 
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Unformatted text preview: Each amino acid has an amino (NH 2 ) group, a carboxyl (COOH) group, and a group of atoms called an R group (where R stands for radical )....
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