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Define osmosis in terms of concentration differences

Learning Objectives

· Define concentration in terms of solute and solvent

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· Define osmosis in terms of concentration differences

· Explain the direction of osmotic pressure for conditions of isotonicity, hypertonicity and hypotonicity

· Distinguish movement of solutes from movement of water in osmosis

· Compute ratios of concentration differences between two neighboring solutions

· Calculate concentrations of unknown solutions after testing osmotic pressure of known solutions

Cellular Compartments and Water Balance

Macromolecules serve many roles in living systems. They can be very, very small like the nucleic acids that form your DNA or they can be very large like the protein that makes a muscle cell. Many macromolecules are devoted to how cells interact with other cells and their environment.

A very important reason that cells need to communicate is that one role of macromolecules is to protect the cell. The intracellular compartment of a cell is a very controlled environment. Molecules crucial to cell survival reside in the intracellular space, while other molecules (including water, ions, steroids, and other small molecules) are permitted limited access to the intracellular compartment through specialized protein channels embedded in the cell’s protective, semipermeable lipid bilayer

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