BSC 114 Lecture Notes - Lecture 8: Beta Sheet, Covalent Bond, Alpha Helix

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Proteins are large organic polymers made of amino acid monomers arranged in a linear chain and joined together by peptide bonds. Account for more than 50% of the dry weight of most cells. There are tens of thousands of different proteins in the human body. A functional protein consists of one or more polypeptides. Polypeptides are unbranched polymers built from the same basic set of 20 amino acids. Amino acids are organic molecules possessing both amino (-nh2) and carboxyl (- > possess functional groups like -oh and -sh. Can donate h+ in solution to become -coo- Can gain h+ in solution to become -nh3+ Amino acids are linked to form amino acid polymers called polypeptides. The carboxyl group of one amino acid is joined to the amino group of another via a dehydration reaction. The resulting bond is called a peptide bond (aka amide bond) When the process is repeated over and over a polypeptide results.

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