Final answer:
Proteins in the cell membrane have diverse functions, including aiding material movement, serving as enzymes, and facilitating cell recognition.
Explanation:
Proteins in the cell membrane serve various functions such as acting as channels or pumps to move materials into or out of the cell. They can also be enzymes, structural attachments for the cytoskeleton, or part of cell recognition sites. Specifically, transport proteins assist in the movement of substances across the membrane.
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