What are the 4 basic structures of amino acids?

Their are 4 different structures of amino acids.

Explanation:

The 4 groups of amino acids:

1) non-polar and neutral

2) polar and neutral

3) acidic and polar

4) basic and polar

The structure of amino acids:

All amino acids have a central carbon atom, which is surrounded with a hydrogen atom. This central carbon atom is also surrounded by a carboxyl group (COOH), an amino group (NH2), and an R-group. What differs the amino acids is its R group. There are 20 different kinds of amino acids, and the R group, or side chain, is different for each one.

I hope this helps!