BIOL1P91 Final Exam Prep test Questions With Verified Answers

BIOL1P91 Final Exam Prep test Questions With Verified Answers What are the 4 functions of the cell membrane 1. seperating internal and external environment 2. regulating traffic in the cell 3. Holding contents of the cell in place 4. creates interface for cellular activity What is the structure of the cell membrane - phospholipid bilayer - integral and peripheral membrane proteins - carbohydrate bonded to proteins - fluid mosaic model - asymmetrical leaflets fluid mosaic model of membrane structure a model that describes the phospholipid bilayer as fluid and integral membrane proteins float freely in the lipid bilayer plasma membrane space between cell and outer environment organelle environment space between organelle and intercellular space glycoprotein protein with a carbohydrate bonded to it glycolipid lipid with a carbohydrate bonded to it What are the 3 types of membrane proteins 1. Transmembrane - goes through bilayer fully 2. Lipid anchored - lipid attached to protein where lipid goes through bilayer 3. peripheral - protein non covalently bonded to integral protein or polar head of leaflet integral membrane protein a protein that is embedded in the membrane (2 types: lipid anchored and transmembrane) what are the 2 functions of membrane proteins cellular processes (resource transport, signaling, etc.) medical usage (70% of medication binds to membrane proteins) how do cell surface carbohydrates attach to lipids and proteins? glycocylation What are the 2 functions of cell surface carbohydrates? identification of cell type cell protection 00:0203:58 What are the 2 ways lipids move in the cell membrane rotating laterally flippases (transfer of lipid between bilayer, requires energy) leaflet half of a phospholipid bilayer Lipid rafts group of similar lipids that move as a whole unit what happens to fluidity of cell membrane at low temperatures? fluidity decreases what happens fluidity of cell membrane at high temperatures? fluidity increases what are the 3 influences on