Amino acid | Definition, Structure, & Facts | Britannica
Dec 17, 2025 · Amino acid, any of a group of organic molecules that consist of a basic amino group, an acidic carboxyl group, and a unique organic side chain. The term amino acid is short …
Amino acid - Building Blocks, Structure, Functions | Britannica
Dec 17, 2025 · Amino acid - Building Blocks, Structure, Functions: One of the most useful manners by which to classify the standard (or common) amino acids is based on the polarity …
Protein - Amino Acids, Structure, Function | Britannica
Nov 29, 2025 · Although more than 100 amino acids occur in nature, particularly in plants, only 20 types are commonly found in most proteins. In protein molecules the α-amino acids are linked …
Structure and properties of amino acids | Britannica
amino acid, Any of a class of organic compounds in which a carbon atom has bonds to an amino group (―NH2), a carboxyl group (―COOH), a hydrogen atom (―H), and an organic side …
Glutamic acid | Neurotransmitter, Protein Synthesis, Metabolism ...
6 days ago · amino acid, any of a group of organic molecules that consist of a basic amino group (―NH 2), an acidic carboxyl group (―COOH), and an organic R group (or side chain) that is …
Building Blocks, Protein Synthesis & Metabolism - Britannica
A protein is a naturally occurring, extremely complex substance that consists of amino acid residues joined by peptide bonds. Proteins are present in all living organisms and include …
Serine | Definition, Structure, & Function | Britannica
Dec 4, 2025 · An amino acid is an organic molecule that is made up of a basic amino group (−NH 2), an acidic carboxyl group (−COOH), and an organic R group (or side chain) that is unique to …
Alanine | Amino Acid, Protein, Metabolism | Britannica
amino acid, any of a group of organic molecules that consist of a basic amino group (―NH 2), an acidic carboxyl group (―COOH), and an organic R group (or side chain) that is unique to each …
Phenylalanine | Amino Acid, Protein, Metabolism | Britannica
Nov 4, 2025 · An amino acid is an organic molecule that is made up of a basic amino group (−NH 2), an acidic carboxyl group (−COOH), and an organic R group (or side chain) that is unique to …
Methionine | Amino Acid, Protein Synthesis, Sulfur | Britannica
Dec 22, 2025 · amino acid, any of a group of organic molecules that consist of a basic amino group (―NH 2), an acidic carboxyl group (―COOH), and an organic R group (or side chain) …