BIO 121 Lecture Notes - Lecture 4: Lipid Bilayer, Facilitated Diffusion, Uniporter

13 views4 pages

Document Summary

Phospholipids are schizoid molecules one end of the molecule wants to be near water and the other wants to be away. Contain fatty acids bonded to glycerol through ester linkages; one fatty acid replaced by phosphate-containing compound. The phospholipid creates an environment which separates the water in the cell and water outside of the cell through a bilayer. Proteins embedded in bilayer by hydrophobic regions hydrophilic regions. Carbohydrates attached to lipids/proteins exposed to watery conditions on either side of bilayer. Biological membranes found in organelles & endomembrane system. Membranes are selective barriers molecules enter in several ways. Diffusion net movement from region of greater concentration to region of lesser concentration. Osmosis special case of diffusion control of movement of water. Movement from region of high water (or low solute) concentration to region of low water (or high solute) concentration. Osmotic potential = pressure required to prevent movement of water into solution. Greater solute concentration = more negative the osmotic potential.

Get access

Grade+
$40 USD/m
Billed monthly
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
10 Verified Answers
Class+
$30 USD/m
Billed monthly
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
7 Verified Answers

Related textbook solutions

Related Documents

Related Questions