chapter 5 review

chapter 5 review - Lecture 5: Chapter 5 Biological...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 5: Chapter 5 – Biological Membranes A. Plasma membrane 1. Physically separates interior of cell from external environment triacylglycerol 2. Receives info. about changes in environment 3. Regulates passages 4. Communicates with other cells 5. Forms compartments to allow separate functions 6. Participates in biochemical reactions Fluid mosaic model cell membranes consist of a fluid bilayer composed of phospholipids in which a variety are embedded or peripheral to it Lipid bilayer fluid or liquidcrystalline state Proteins move within the membrane Flexible Capable of fusing with other membranes allows transport of materials within cell Forms vesicles bud from 1 cell membrane fuse with another membrane to facilitate movement of materials from 1 part of the cell to another Characteristics of lipid bilayer ensure proper membrane fuction in fluctuating temp. Transport
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
ceases if too rigid Low temp., motion of FA chains slowed Membrane becomes semisolid Component lipids important Double interacting through Van der Waals forces such forces prevent cellular membrane from falling apart More fluid Unsaturated fats lower the temperature at which membranes solidify Plasma Membrane Integral membrane proteins embedded in bilayer (not easily removed) Amphipathic; hydrophilic heads extend into cytoplasm; hydrophobic regions interact with FA tails of membrane phospholipids Transmembrane proteins extend completely through membrane (as both α helices and ϐ sheets or barrel configuration) Peripheral Membrane Proteins at inner or outer surface of bilayer bound to exposed integral proteins by noncovalent bonding (easily removed) Membrane Protein Synthesis Transport vesicle delivers glycoprotein to plasma membrane Transport vesicle fuses with plasma membrane. Carbohydrate chain extends outward. Replenishes plasma membrane When a transport vesicle buds from the Golgi complex, the modified region of the protein remains inside the membrane compartment Membrane Proteins
Background image of page 2
Transport materials Act as enzymes or receptors Recognize cells Structurally link cells together (a) Anchoring. Some plasma membrane proteins, such as integrins, anchor the cell to extracellular matrix; they also connect to microfilaments within cell
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/18/2012 for the course BIO 101 taught by Professor Martin during the Fall '08 term at Rutgers.

Page1 / 8

chapter 5 review - Lecture 5: Chapter 5 Biological...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online