BIOL 382 Lecture Notes - Lecture 4: Tubulin, Signal Transduction, Tight Junction
Document Summary
Isolate the cell from the environment: organize pathways into discrete subcellular organelles. Much of the variation come form the profile of phosphoglycerides: A complex modification to glycolipids is imparting a negative charge to the polar head group. Cholestrol is absent from mitochondrial membranes, but it can represent almost 50% of lipid components of other membranes: disrupts interaction between fatty acids increasing fluidity, strengthens interactions between polar head groups, limiting permeability of small molecules. Homeoviscous adaptation is the ability for cells to regulate the fluidity of the membrane by controlling the nature of lipids. Low temperature can increase van der waals forces between lipids which can restrict fluidity. Proteins can make up more than half of the mass of the membrane. Integral membrane proteins are embedded in the membrane. What is this type of transportation dependent on? membrane. No, there are not specific transporters needed as molecules cross the lipid bilayer. A protein transporter is needed for this kind of.
