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The structure of proteins contains blocks of amino-acids whose composition is made of the following 5 chemical elements: oxygen, hydrogen, carbon, nitrogen and sulphur.
In the structure of proteins can be found 20 amino acids and the difference between amino acids is made by the functional group R. The amino acid that has a simple structure is glycine, because the group R is represented by one hydrogen atom.
There exists three functional groups R of amino acids such that: hydrocarbon R groups, neutral R groups and acid or base R groups.
There exists 6 amino acids with hydrocarbon R groups, 7 amino acids with neutral R groups and 6 amino acids with acid or base R group.
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