CHEM 102 Lecture Notes - Lecture 28: Oligopeptide, Glutamine, Covalent Bond
12 Apr 2017
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Document Summary
Characteristics of proteins: a protein is a naturally occurring, unbranched polymer in which the monomer units are amino acids o. Proteins are the most abundant molecule in cells after water -- accounts for about 15% of a cell"s overall mass o o. Elemental composition -- carbon, hydrogen, nitrogen, oxygen, and sulfur. The average nitrogen content of proteins is 15. 4% by mass: also present are iron, phosphorus, and some other metals in some specialized proteins. Amino acids: amino acid: an organic compound that contains both an animo and a carboxyl group attached to the same carbon. The position of the carbon atom is alpha. Nh2 group is attached at the alpha carbon atom. Cooh group is attached at the alpha carbon atom. R side chain -- vary in size, shape, charge, acidity, functional groups present, hydrogen bonding ability, and chemical reactivity.
