1 Membranes separate their contents from the environment. 2  Cell membranes separate the cell contents from its environment, and organelle membranes separate the organelle contents from their environment. 3  Membranes regulate the movement of materials through them.
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In Unix, what is a group? In Unix, a group is a logical collection of users on a system, the primary use of which is to assign group ownership of files and directories. As a result, certain groups of users on a system can all have the same access rights to the designated files and directories.