Determine the effects of osmotic pressure on different types of microorganisms. If you recall, osmosis is the net movement of water for another solvent through a semipermeable membrane in order to equalize solute concentrations on either side. If the medium is isotonic when compared to the cell there is no net movement of water (same osmotic pressure), since solute concentration in the medium is equal to solute concentration in the cell. If the mediurn is hypotonic lower osmotic pressure), the cells will gain water through osmosis, since solute concentration is greater within the cell. If the medium is hypertonic (high osmotic pressure), the cells with lose water through osmosis, since solute concentration is greater in the medium, Halophiles are organisms that can survive in environments of high osmotic pressure (salty environments). Obligate halophiles are restricted to environments with high osmotic pressure (salty environments), while facultative halophiles do not require high salt concentrations, but can tolerate them, meaning they can survive in both normal and salty environments. Halophiles can further be categorized by the extent of their salt tolerance. Moderate halophiles grow optimally between 3-15%, Halotolerant bacteria can tolerate up to 8%, and extreme halophiles grow above 15%. Indicate the effect of the medium on the cells below (no effect, burst, shrink): 1. A cell is placed in a hype


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