Amino acid | Definition, Structure, & Facts | Britannica
2024年11月27日 · 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 each amino acid. The term amino acid is short for α-amino [alpha-amino] carboxylic acid.
Amino acid - Building Blocks, Structure, Functions | Britannica
2024年11月27日 · What is an amino acid? What are the 20 amino acid building blocks of proteins? What is the difference between standard and nonstandard amino acids? What are some industrial uses of amino acids?
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 (―NH 2), a carboxyl group (―COOH), a hydrogen atom (―H), and an organic side group (called ―R). They are therefore both carboxylic acids and amines. The physical and chemical properties unique to each result from the properties of the R ...
Acid | Definition, Examples, Types, Uses, & Facts | Britannica
2024年11月13日 · What is an amino acid? What are the 20 amino acid building blocks of proteins? What is the difference between standard and nonstandard amino acids? What are some industrial uses of amino acids?
What is an amino acid? | Britannica - Encyclopedia Britannica
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 each amino acid. The term amino acid is short for α-amino [alpha-amino] carboxylic acid.
Protein - Amino Acids, Structure, Function | Britannica
2024年12月17日 · The simplest amino acid is glycine, in which R is a hydrogen atom. In a number of amino acids, R represents straight or branched carbon chains. One of these amino acids is alanine , in which R is the methyl group (―CH 3 ).
Amino acid - Reactions, Structure, Synthesis | Britannica
2024年11月27日 · What is an amino acid? What are the 20 amino acid building blocks of proteins? What is the difference between standard and nonstandard amino acids? What are some industrial uses of amino acids?
Amino acid - Nonstandard, Synthesis, Biochemistry | Britannica
2024年11月27日 · What is an amino acid? What are the 20 amino acid building blocks of proteins? What is the difference between standard and nonstandard amino acids? What are some industrial uses of amino acids?
Phenylalanine | Amino Acid, Protein, Metabolism | Britannica
phenylalanine, an amino acid present in the mixture obtained upon hydrolysis of common proteins. Human hemoglobin (the oxygen-carrying pigment of red blood cells) is one of the richest sources of phenylalanine, yielding 9.6 percent by weight.
Protein - Amino Acids, Physicochem. | Britannica
2024年12月17日 · The amino acid composition of proteins. Structures of common amino acids; Physicochemical properties of the amino acids; Amino acid sequence in protein molecules; Levels of structural organization in proteins. Primary structure; Secondary structure; Tertiary structure; Quaternary structure; The isolation and determination of proteins