BIOL 1000 Lecture Notes - Lecture 2: Action Potential, Ergosterol, Saturated Fat
Document Summary
The plasma membrane does not provide a shape or mechanical strength to the cell. Cytoskeletal filaments provides the shape & mechanical strength. Extracellular matrix coats the outside of the plasma membrane (used to allow attachment between cells) Carboxyl group attaches the fatty acid chain (tail) Forms a line; head outside, tails in. The bilayer curls to form a circle so no water gets in. All hydrophobic tails are protected by the head. Reduces number of h attached to the c. Palmitic c (16:0) - 16 h, no double. Stearic c (18:0) - 18 h, no double. Composition of monolayer differs from the other monolayer(exterior does not match exterior) Fluidity affects cellular function (endocytosis, exocytosis, membrane signaling, transport etc. ) An increase in temp, the shape transition is made from a more rigid membrane to a more fluid one. Affects tight packing of lipid molecules in the membrane.
