BIO 185 Lecture 14: Lecture 14
Document Summary
3/31/15 less entropy => energy released => more entropy examples: diffusion, chemical reactions these are exergonic because they release energy (- g) Movement of phospholipids: lateral movement (~10^7 times per second) switching places (happens a lot) Ip- op (~once per month) crosses the entire membrane to the other side the heads are polar (hard to drag through a non-polar region) Organisms in super cold climates: more unsaturated fatty acids, lots of cholesterol. Organisms in super hot climates: more saturated fatty acids, risk of fully melting, lots of cholesterol. Fluid mosaic model - types of proteins, permeability: Transport proteins: hydrolyzing atp active transport from low solute concentration to high solute concentration also move according to charge (negative to positive: na+/k+ pump (slide 17) goes against both of their gradients. Moving hydrogen from low to high concentration: endergonic (requires energy) Moving hydrogen down its concentration gradient: exergonic (releases energy) Moving sucrose into the cell: endergonic (requires energy)
