BIO 209 Lecture Notes - Lecture 13: Triglyceride, Amphiphile, G Protein–Coupled Receptor
6 Dec 2016
School
Department
Course
Professor
Document Summary
Membrane structure, membranes form bilayers that contain membrane bound and transmembrane proteins, phospholipids are the most substituted ones. Fluid nature of membrane allows lateral movement of lipid and protein components = fluid mosaic model. There is very little transversal movement of lipids and proteins. If it does happen, it requires the protein flippase: occurs during apoptosis. Membrane functions: compartmentalization- membrane"s form continuous sheets to enclose intracellular compartments, not everything passes through the membrane easily, microcompartments are formed by organelles. Scaffold for biological activities- organizes enzymes for interaction: orientation allows movement into or out of the cell. Selectively permeable membrane- regulates exchange of substances between compartments. Transporting solutes- regulates movement of substances between compartments. Big hydrophilic molecules require transports: responding to external signals- transduce signals from outside of cells in. Intercellular interaction- recognize and interact with adjacent cells. Energy transduction- transduce photosynthetic energy, convert chemical energy to atp, store energy.
