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BIO130H1 (446)
Lecture

First lecture by Mitchell. Includes diagrams used in power point.

3 Pages
152 Views

Department
Biology
Course Code
BIO130H1
Professor
Jane Mitchell

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Pg. 617-624
Made of phosphoglyceride molecule
{
Bilayer=5nm
{
Have a polar head and non-polar tail
|
Rapid lateral diffusion
|
Rarely flip flop; flipped by translocatorproteins
|
Synthesized in cytosolic leaflet of endoplasmic reticulum
|
Phospholipids
{
In animals is cholesterol
|
Plants have plant cholesterol
|
Up to 1:1 ratio of cholesterol to phospholipids
|
Help maintain fluidity of membrane
|
Steroids
{
Created on luminal face of golgi apparatus
|
Gangliosides contain sugar groups which have charge
|
Usually found on apical side of epithelia, harsher conditions,
sugar charges may affect electrical field
|
Glycolipids
{
Low temperature decreases fluidity
{
Saturated fatty acid chains decreases fluidity
{
Longer fatty acid tail decreases fluidity
{
Membrane Proteins
Amphiphilic
{
Single alpha-helix (1)
|
Single pass:
{
Multiple alpha-helices (2)
|
Beta-barrels (3)
|
Multiple pass
{
Proteins can be anchored by amphiphilic alpha-helix
{
Includes organelles
Does not include
Contained within organelles
Membrane Structure
Thursday, March 03, 2011
11:31 AM
BIO130 Page 1
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Description
MembraneStructure Thursday,March03,2011 11:31AM Pg.617-624 { Madeofphosphoglyceridemolecule { Bilayer=5nm Includesorganelles Doesnotinclude Containedwithinorganelles { Phospholipids Havea polarheadand non-polartail Rapidlateraldiffusion Rarelyflipflop;flippedbytranslocatorproteins Synthesizedincytosolicleafletofendoplasmicreticulum Screenclipping taken: 3122011, 5:52 PM { Steroids Inanimalsischolesterol Plantshaveplantcholesterol Upto 1:1 ratio ofcholesteroltophospholipids Screenclipping taken: 3122011, 5:53 PM
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