BIOL130 Chapter Notes - Chapter 6: Phosphatidylethanolamine, Phosphatidylinositol, Phosphatidylcholine
5 Aug 2016
School
Department
Course
Professor
Document Summary
Compartmentalization (in eukaryotes): create separate environments for different activities. Scaffold for biochemical activities all membrane lipids are amphipathic: posses both hydrophobic and hydrophilic regions phospholipid tails. Tightly packed tails membrane more viscous, less fluid. Desaturate fatty acids (makes it more fluid to deal with the cold) Change length of fa chains (yeast, bacteria) Asymmetry of lipid bilayer appearance of ps in outer leaflet" of membrane usually indicates that cell is going to die. Molecules move by diffusion solutes will spontaneously spread out" (increased entropy) until concentrations on all regions are equal no net flux. Concentration gradient: uneven distribution of a substance across a gradient. Potential energy: an object can store energy as the result of its position. Dynamic equilibrium: a state of balance between two processes. Osmosis: diffusion of water across a semi-permeable membrane down its concentration gradient (towards a higher solute concentration)
