01:119:115 Lecture Notes - Lecture 4: Glycerol, Carboxylic Acid, Alpha Helix
21 Sep 2015
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5. 3: lipids are a diverse group of hydrophobic molecules. Do not dissolve in polar solvents such as water. 1. a glycerol = 3 carbon alcohol containing 3 - oh. Phosphate group + other group = hydrophilic head. Made of 3 rings with 6 c and one ring has 5 c. Steroids differ in side chains or functional groups attached. Example: cholesterol: in animals; not found in plants. 50% of the dry mass of most cells. All have some structure, an alpha carbon attached to. Essential amino acids: ones we can"t make for ourselves and must get from diet. Join together in linear sequences by peptide bonds. Carboxyl group of one aa joined to amino group of anther area. Molecule composed of many amino acids held together by peptide bonds joined in a linear sequence. Proteins is a polypeptide in correct 3d shape. Polypeptide is a sequence of amino acids, with a carboxyl(c-terminus) end and an amino end(n-terminus)
