Biology 1202B Lecture Notes - Lecture 2: Conformational Change, Atp Hydrolysis, Membrane Potential
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10 May 2016
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All of the regions of the cell is surrounded by membrane. There are membranes that are similar in structure made of phospholipids. They are different as they have different proteins embedded in membranes. Membranes are composed of a selectively permeable phospholipid bilayer. Proteins embedded or attached to the membrane perform membrane functions. Saturation refers to c bonds to h. Fully saturated bound to maximum number of hydrogen. Has phosphate, glycerol, and 2 fatty acids in common. Assembly of bilayer is spontaneous in an aqueous environment always in motion. Structure is favoured low energy state. Hydrophobic fatty acid chains minimize water contact by aligning in the core. Proteins embedded or bound to the membrane can also move laterally. Although fluid, cell structure is maintained by membrane protein attachment to cytoskeleton. Human and mouse cells grown separately in tissue culture. Human and mouse membrane proteins tagged with different dye molecules. Membrane fluidity influenced by fatty acid saturation and temperature.
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