Biology 1202B Lecture Notes - Lecture 1: Membrane Transport, Facilitated Diffusion, Phospholipid
9 Apr 2016
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Selectively permeable: lets thing n and lets things out. Proteins embedded or attached to the membrane perform membrane functions. Amphipathic molecules ( one end is hydrophobic and other is hydrophilic, one polar and one non polar) Saturation refers to c bonds to h. Fully saturated- bound to maximum number of hydrogen. Assembly of bilayer is spontaneous in an aqueous environment (20 nanosecs of simulation time. Proteins embedded or bound to the membrane can also move laterally. Although fluid, cell structure is maintained by membrane protein attached to cytoskeleton. Temperature drop-> fat acids/ phospholipids stop moving (humans can regulate body temp but other organisms must maintain fluidity in different ways. Peripheral proteins- do not interact with hydrophobic core polar and non polar amino acids. Movement of a substance from a region of high to low concentration. Larger/ charged polar molecules can pass through. Voltage across membrane, binding of signal molecules.
