Amino acids may be acidic, alkaline or neutral. How does this happen? What are essential and non-essential amino acids? Name one of each type.

Explanation

Amino acids may be acidic, basic or neutral depending upon the relative number of amino and carboxyl group present in the molecule.
Equal number of amino and carboxyl groups makes it neutral, more number of amino than carboxyl groups makes it basic and more carboxylic group as compared to amino groups makes it acidic.
Essential and non-essential amino acids
(a) Essential amino acids are the c-amino acids which are needed for health and growth of human beings but are not synthesised by the human body, e.g. valine, leucine.
(b) Non-essential amino acids are the `alpha`-amino acids which are needed for health and growth of human beings and are synthesised by the human body, e.g. glycine, aspartic acid.