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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 Since each protein molecule consists of a long chain of amino acid residues, linked to each other by peptide bonds, the hydrolytic cleavage of all peptide bonds is a prerequisite for the quantitative determination of the amino acid residues. Examples of amino acids include glycine and threonine.

One of the most useful manners by which to classify the standard (or common) amino acids is based on the polarity (that is, the distribution of electric charge) of the r group (e.g., side chain). They combine ionically with dna to form nucleoprotein complexes known as nucleosomes. Although more than 100 amino acids occur in nature, particularly in plants, only 20 types are commonly found in most proteins

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 group (called ―r).

Structurally, proteins and peptides are very similar, being made up of chains of amino acids that are held together by peptide bonds (also called amide bonds) So, what distinguishes a peptide from a protein? A large protein enzyme molecule is composed of one or more amino acid chains called polypeptide chains The amino acid sequence determines the characteristic folding patterns of the protein’s structure, which is essential to enzyme specificity.

Amino acids via their various chemical functionalities (carboxyls, amino, and r groups) can undergo numerous chemical reactions. An example of a codon is the sequence aug, which specifies the amino acid methionine The aug codon, in addition to coding for methionine, is found at the beginning of every messenger rna (mrna) and indicates the start of a protein.

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