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Published bySophia Francis Modified over 8 years ago
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Phospholipids Membrane Proteins
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Maintains fluidity in the membrane!!! (think about the cotton plant!)
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Maintains shape, act as enzymes, transport in/out of cell, cell communication (receptors)
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© 2012 Pearson Education, Inc. Animation: Membrane Selectivity Right click on animation / Click play
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Only small, non-polar molecules move through the bilayer (ex: O2, CO2, H2O, Lipid- Hormones, Fatty Acids) **Ionic, Charged, Large, Polar (hydrophilic) molecules CANNOT cross the membrane without help!)**
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Inactive structural supports composed of polysaccharides Plants (cellulose), Fungi (chitin), Many Prokaryotic cells (peptidoglycan)
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Figure 5.3A Molecules of dye Membrane Pores Net diffusion Equilibrium
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Figure 5.3B Net diffusion Equilibrium
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Measurement of the relative concentrations of solute between two solutions (inside and outside of cell) Hypertonic – More solute/less solvent Hypotonic: Less solute/More solvent Isotonic: Equal concentrations **These terms are COMPARATIVE**
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Figure 5.4 Osmosis Solute molecule with cluster of water molecules Water molecule Selectively permeable membrane Solute molecule H2OH2O Lower concentration of solute Higher concentration of solute Equal concentrations of solute
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