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Name: Taylor
Status: Student
Grade:  9-12
Location: N/A
Country: United States
Date: November 2008
Question:
What are the channels and pumps in the cell membrane composed of?


Replies:
Pumps are protein molecules that can switch their orientation from the outside of the cell to the inside. Channels are holes in the membrane that have a gate or pump that controls entry of molecules.

Ron Baker, Ph.D.


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