CAS BI 108 Chapter Notes - Chapter 3: Disulfide, Beta Sheet, Amine

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Regulate passage of substances across the cellular membrane. All proteins are polymers made up of 20 amino acids in different proportions and sequences. The end of the peptide linkage is the carboxyl group of the last amino acid. This c n linkage cannot rotate freely and so limits the folding of the polypeptide chain. The oxygen bound to the carbon (c=o) in the carboxyl group carries a slight negative charge whereas the hydrogen bound to the nitrogen (n-h) in the amino group is slightly positive. Both secondary and tertiary structures are derived from primary structure: t h e. Ionic attractions can form between positively and negatively charged side chains, forming salt bridges between amino acids. This occurs between + and charged amino acids vi. In these cases, inappropriate binding may be irreversible. All are constructed from monosaccharides that are covalently bonded by condensation reactions that form glycosidic linkages. Synthesis of a triglyceride involves three condensation reactions.

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