Peptide are molecules formed from two or more amino acids. If the number of amino acids is still below 50 molecules called peptide, but if more than 50 molecules called protein.

Amino acids bonded together by peptide bonds. Peptide bond occurs when the nitrogen atom at one amino acid binds to the carboxyl group of another amino acid. Peptides found in every living being and a role in several biochemical activities. Peptides can be enzymes, hormones, antibiotics, and receptors.

Peptide can be grouped according to similarity of structure and function.
Ribosomal peptide
Ribosomal peptides synthesized from mRNA translation. These peptides function as hormones and signaling molecules in higher organisms. In general, these peptides have structure linear.

Non ribosomal peptide
Non ribosomal peptides synthesized by the enzyme complex. The peptide was found in unicellular organisms, plants, and fungi. In this peptide there is a complex core structure and contain different arrangements for the conduct of chemical manipulation to produce a product. In general, this form of cyclic peptide, although there also a linear form.

Digested peptides
This peptide formed from the non-specific proteolysis in the digestive cycle. Peptide digestion results in general are ribosomal peptides, but not formed from the translation of mRNA. These peptides can also be formed from proteins digested with specific proteases.

Source from: Wikipedia

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