An organic compound, formed by dehydration of an amino acid, containing a carboxyl group and an amino group, which is amphoteric.

The amino group of one amino acid and the carboxyl group of another amino acid can be condensed to form a peptide, forming an amide group called a peptide bond in protein chemistry.

Amino acids are the smallest molecules and proteins are the largest. Two or more amino acids are dehydrated and condensed to form a number of peptide bonds to form a peptide, and multiple peptides are folded in multiple levels to form a protein molecule. Proteins are sometimes called "peptides". A dipeptide, or dipeptide for short, is a fragment of a protein made up of two amino acids.

Expanded Information

There are 20 types of amino acids, which can be broadly categorized into three groups: essential amino acids, semi-essential amino acids, and non-essential amino acids.

The essential amino acids are: lysine, tryptophan, phenylalanine, methionine, threonine, isoleucine, leucine, and valine.

The human body non-essential amino acids are these 10 non-essential amino acids are: glycine, tyrosine, histidine, threonine, cystine, aspartic acid, proline, serine, glutamic acid, arginine.

Baidu Encyclopedia - Amino Acids

Baidu Encyclopedia - Peptides