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What are acidic, basic and neutral amino acids ?
Answer
Depending upon the number of amino group and carboxylic groups, amino acids are classified as neutral, acidic and basic.

The acidic amino acids contain one amino and two carboxyl groups each, e.g. glutamic acid and aspartic acid.
The basic amino acids have two amino groups and one carboyxl group, e.g. lysine and arginine.
The neutral amino acids have one amino group and one carboxyl group e.g. alanine, glycine, valine and phenylalanine.