BIOL 1201 Chapter : 6 Membranes And Membrane Function

• School: LSU
• Department: Biological Sciences
• Course: BIOL 1201
• Professor: All

Document Summary

Amphipathic: hydrophobic (nonpolar) regions, hydrophilic (polar) regions exposed regions. Raised pigs wearing underwear in a hot room; at different temperatures. Changed the properties of the subcutaneous fats: had a higher melting point. Membrane fluidity adjusted by changing the ratio of unsaturated to saturated fatty acids. Increases the fluidity of the membrane (the ratio of unsaturated to saturated fats) In a phospholipid, you can adjust the type of fat found in the membrane by making it kinky. Lateral movements of phospholipids are rapid; flip-flopping is rare (once per month) Examples of things that can pass through phospholipid layers (plasma membrane): Sometimes: sodium concentration 5-15 mm in the cell; 145 mm outside, more work. There is no net change in solute concentration. When concentrations on both sides of a barrier are equal . Semi-permeable barrier a layer in which only some types of molecules pass through (hence, semi-permeable)