BIO 202 Lecture Notes - Lecture 5: Lipid Bilayer, Hydrogen Bond, Peptide Bond

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Contains 2 fatty acids and a phosphate group attached to a glycerol. Amphipathic because the tails (2 fatty acids) are hydrophobic whereas the head are hydrophilic. When placed in aqueous environment, the hydrophobic tails face away from the water and the hydrophilic heads face the water. This forms a phospholipid bilayer or a phospholipid micelle (round/circle) Characterized by a carbon skeleton consisting of 4 fused rings. Derived from cholesterols: important for biological functions in the animal cell membranes. Account for more than 50% of the dry mass of most cells. The sequence of amino acids determines the protein"s 3d structure. A protein"s structure determines the work it does. R-groups determine the properties of the protein. Bonding between the carboxyl group and the amino acid is known as a peptide bond. Disulfide bridge: quaternary: aggregation of the tertiary structure. Salt concentration, ph, temperature, and salinity determines the protein conformation. The loss of a protein"s shape is called denaturation.