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Updated: Jan 19, 2026

Amino acids: Structure, Classification, D- & L-Isomers
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Amino acids: Structure, Classification, D- & L-Isomers

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Music notes to amino acid sequence: A STEAM approach to study protein structure

Sinan Can Acan1, Naciye Leyla Acan2

  • 1Melexis Technologies NV, Transportstraat 1, 3980, Tessenderlo, Belgium.

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Amino acids03:42

Amino acids

Amino acids are the monomers that comprise proteins. Each amino acid has the same fundamental structure, which consists of a central carbon atom, or the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom. Every amino acid also has another atom or group of atoms bonded to the central atom known as the R group. There are 20 common amino acids present in proteins, each with a different R group. Variation in the amino acid sequence is responsible for...
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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
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