This PowerPoint relates to the Plasma Membranes section of the BY1 specification. Students learn about the: (a) Principal components of the plasma membrane and the fluid mosaic model. Factors affecting permeability of the membrane. (b) Transport mechanisms: diffusion and factors affecting the rate of diffusion, osmosis and water potential, pinocytosis, facilitated diffusion, phagocytosis, secretion (exocytosis), active transport and influence of cyanide.
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