Simple Diffusion Quiz

5 Questions  I  By Lqq889 on April 23, 2010
How are molecules distributed in the environment? As explained in this animation, the random movement of molecules in a gas or a liquid will cause the molecules to become evenly distributed in the environment. If we look at the environments in which cells exist, for example inside a body or in a pond, we do not see an even distribution of molecules associated with life. Cells prevent, control, and even work counter to diffusion to create concentration gradients, to exclude waste or harmful materials, and to store needed materials. Life can be described as a process of controlling the diffusion of molecules.

  

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1.  Simple diffusion is defined as the movement of
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2.  When sugar is mixed with water, equilibrium is reached when
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3.  The rate of diffusion is affected by which of the following?
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4.  The molecules in a solid lump of sugar do not move.
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5.  Diffusion is one of the processes whereby materials are exchanged between a cell and its environment.
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