PSYCH 1101 Lecture Notes - Lecture 7: Lipid Bilayer, Membrane Lipids, Cell Membrane
19 Sep 2016
School
Department
Course
Professor
Document Summary
Membranes act as selective barriers: bacterial cell, eukaryotic cells also have internal membranes (organelles) More than a barrier: receiving information, import and export of molecules (ex. Elastic, fluidity: ability to accommodate cell division. Membranes are composed of lipids and proteins: 5 nm in diameter. Membrane lipids are amphipathic: hydrophilic head, hydrophobic tails. Phospholipids are the most abundant lipids in membranes: glycerol intermediary between hydrocarbon tail and polar head, hydrocarbon chains. Saturated (straight, every c has two hydrogens) Unsaturated (typically have one double bond between two ch) There are many different phospholipids in membranes; some of the major ones are: phosphatidylethanolamine, phosphatidylserine, phosphatidylcholine, sphingomyelin. Different way in how fatty acids contain to glycerol: all phospholipids phosphate that attaches to different groups . Membranes also contain cholesterol and glycolipids: glycolipids. Glucose instead of phosphate that connects to lipid: cholesterol. Membrane lipids form bilayers in water: hydrophobic tails come and associate together, half heads pointing up, half heads pointing down.
