BIOA02H3 Chapter Notes - Chapter 5: Peripheral Membrane Protein, Lipid Bilayer, Membrane Protein
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BIOA02H3 Full Course Notes
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Document Summary
Plasma membrane selectively permeable membrane; allow for the uptake of key nutrients and elimination of key products while maintaining a protected environment for cellular processes to occur. The subsequent development of internal membranes allowed for compartmentalization of processes and increased complexity. Fluid mosaic model proposes that membranes are not rigid with molecules locked into place but rather consist of proteins within a mixture of lipid molecules the consistency of olive oil. Myelin membrane that functions to insulate nerve fibres, composed mostly of lipids. Lipid a diverse group of water insoluble molecules that includes fats; phospholipids, which are the dominant lipids in membranes; and steroids. Fatty acid a head group attached to two long chain of carbon and hydrogen (hydrocarbon) Phospholipids amphipathic: contains a region that is hydrophobic (water fearing) and hydrophilic (water loving) Hydrophobic effect the tendency of polar molecules like water to exclude hydrophobic molecules such as fatty acids. Two factors that influence the fluidity of the lipid bilayer:
