A gradient occurs when something exists in more concentration in one area than the other area. There is also a connection between those two areas. A living cell requires distinctinternal conditions, which are quite different from the external environment. This differential requirement forms the basis of a biochemical gradient.

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Chapter 1, Problem 18CYR

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A gradient occurs when something exists in more concentration in one area than the other area. There is also a connection between those two areas. A living cell requires distinctinternal conditions, which are quite different from the external environment. This differential requirement forms the basis of a biochemical gradient.

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