BIO 1070 Chapter Notes - Chapter 5: Passive Transport, Lysosome, Archaea

• School: St. John's University
• Department: Biology
• Course: BIO 1070
• Professor: Matteo Ruggiu

Document Summary

Important functions of cell membranes: uptake + export of ions + molecules, cell compartmentalization, protein sorting, anchoring of cytoskeleton, production of energy intermediates (atp + nadph, cell signaling, cell + nuclear divison, adhesion of cells to each other + to extracellular matrix. 5. 2 fluidity of membranes: membranes are fluid individual molecules remain in close association but have the ability to readily move within the membrane, actually semifluid bc fluid means movement in 3 dimensions but membrane can only move in 2 dimensions (semifluid, biochemical properties of phospholipids affect the fluidity of the phospholipid bilayer, shorter acyl tails are less likely to interact with each other which makes the membrane more fluid, double bonds create kinks in the fatty acyl tail making it more difficult for neighboring tails to interact and making the bilayer more fluid, at high temps, cholesterol makes the membrane les fluid + at low temps cholesterol makes the membrane more fluid.