BIO 1140 Lecture Notes - Lecture 4: Phospholipid, Passive Transport, Cytoskeleton

• School: University of Ottawa
• Department: Biology
• Course: BIO 1140
• Professor: Kathleen Gilmour

Document Summary

Lecture 4 - topic 2 (membrane proteins) last lecture highlights. Amphipathic nature of phospholipids key to bilayer structure (hydrophobic interactions) and allows it to function as a permeability barrier. Membrane also contains significant amounts of sterols (except in prokaryotes; 4-ring hydrocarbon skeleton with hydrophobic tail and hydroxyl group) and small amounts of glycolipids (glycerol or sphingosine backbone with carbohydrate replacing phosphate r-group; function as signals) A: hydrophobic, hydrophilic, these types of interactions hold membrane together. A: i lipid bilayer, the outer and inner halves, have different lipid compositions. (glycolipids for example. More prominent on outer layer, and very sparse on the inner layer) A: fatty acids, are able to enter the muscles more rapidly: distinguish between correlation and causation. A:causation, you need to show that the change in one is caused by the change in another. It is the r-groups of the amino acids, that give each amino acid their properties. String of amino acids give you structure of protein.