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  • Amino acid | Definition, Structure, Facts | Britannica
    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 for α-amino [alpha-amino] carboxylic acid Examples of amino acids include glycine and threonine
  • Amino acid - Building Blocks, Structure, Functions | Britannica
    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 (that is, the distribution of electric charge) of the R group (e g , side chain) Group I amino acids are glycine, alanine, valine, leucine, isoleucine, proline, phenylalanine, methionine, and tryptophan The R groups of these
  • Amino acid - Origin, Life, Earth | Britannica
    Amino acid - Origin, Life, Earth: The question of why organisms on Earth consist of l-amino acids instead of d-amino acids is still an unresolved riddle Some scientists have long suggested that a substantial fraction of the organic compounds that were the precursors to amino acids—and perhaps some amino acids themselves—on early Earth may have been derived from comet and meteorite impacts
  • Amino acid - Nonstandard, Synthesis, Biochemistry | Britannica
    Amino acid - Nonstandard, Synthesis, Biochemistry: Nonstandard amino acids refer to those amino acids that have been chemically modified after they have been incorporated into a protein (called a “posttranslational modification”) and those amino acids that occur in living organisms but are not found in proteins Among these modified amino acids is γ-carboxyglutamic acid, a calcium-binding
  • 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 group, particularly its tendency to interact with
  • Codon | Definition, Function, Examples | Britannica
    Codon, any of 64 different sequences of three adjacent nucleotides in DNA that either encodes information for the production of an amino acid or serves as a stop signal to terminate translation Of the 64 possible codon sequences, 61 specify the 20 amino acids that make up proteins and three are stop signals
  • Metabolic disease - Amino Acid, Disorders, Metabolism | Britannica
    Each amino acid is further broken down into ammonia, carbon dioxide, and water Disorders that affect the metabolism of amino acids include phenylketonuria, tyrosinemia, homocystinuria, non-ketotic hyperglycinemia, and maple syrup urine disease
  • Protein - Alpha Helix, Beta Sheet, Coil | Britannica
    Protein - Alpha Helix, Beta Sheet, Coil: The nitrogen and carbon atoms of a peptide chain cannot lie on a straight line, because of the magnitude of the bond angles between adjacent atoms of the chain; the bond angle is about 110° Each of the nitrogen and carbon atoms can rotate to a certain extent, however, so that the chain has a limited flexibility Because all of the amino acids, except
  • Protein - Hormones, Structure, Function | Britannica
    The amino acid sequences of calcitonin from pig, beef, and salmon differ from human calcitonin in some amino acids All of them, however, have the half- cystines (C) and the prolinamide (P) in the same position





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