Part of the "Learn.Genetics" collection of resources.
Provided by the University of Arizona's Biology Project, this tutorial covers aspects of cell membranes from transport to energy requirements.
Molecular Biology of the Cell is the classic in-depth text reference in cell biology.
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Google - Research database allows searching of the scholarly literature.
From PBS Learning Media, this interactive feature illustrates the the structures that make it possible for materials to pass through the cellular membranes.
From John Kyrk, learn about a cell membrane and how it works.