BIOL 111 Chapter Notes - Chapter 5: Amphiphile, Glycerol, Osmosis

180 views5 pages

Document Summary

Thecelltheory allorganisms aremadeupofcells thecellisthefundamental unit of life cellscomefrompreexistingcells. Phospholipids thelipidsfound in cellmembranes glycerolbackboneattached mum to a phosphategroup4 2 fattyacids amphipathic molecules w bothhydrophilic4 hydrophobicregions micelles lipidsw bulkyheads4 asinglefattyacidtail wedgeshaped 4pack bilayer lipidsw nonbulkyheads4 2 fattyacidtails liposomes phospholipidsformaround a centralspacewhenplacedin a neutral intosphericalstructures ph environment. Mtheatimpids can movefreely within the plane fluid lessffluid maycapture macromolecules present in the solution fluid long tail tighter packing lessmobility doublebonds loosepacking more mobility. 9fluidity cholesterol anotherlipid found in animal membranes amphipathic cholesterol regular cell temperatures cholesterol lessensmobility due to the rigidringstructures lowtemperatures cholesterolimprovesmobility preventsthephospholipidsfrom packingtightly lipid rafts sphingolipidsassembled intodefinedplatchemesponentsaren"trandom. Proteins arefoundin membranesas well transporterproteins movemoleculesacrossthemembrane receptorproteins receivesignalsfromtheenvironment enzymes catalyzechemicalreactions anchors attachtootherproteins help maintain structure shape membrane. 4 can"t beseparated w out destroyingthe membrane integral membraneproteins permanentlyassociatedof the cell. Peripheralmembraneproteins temporarilyassociatedofthe bilayer or integralproteinsthrough weak interactions noncovalent manmeymbraneproteins spanthe entirebilayer 3regions a hydrophilic. Plasmamembrane themembranesurroundingallcells diffusion therandommovementofmolecules facilitateddiffusion whena moleculediffusesthrough amembraneprotein4. 4 is a mosaic mixture of 1iffs4proteins is a fluid structure laterally mmmm bypassesthelipidbilayer.

Get access

Grade+20% off
$8 USD/m$10 USD/m
Billed $96 USD annually
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
40 Verified Answers
Class+
$8 USD/m
Billed $96 USD annually
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
30 Verified Answers

Related Documents

Related Questions