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Krmogi · Answer 1 · 2016-02-21T13:42:16+0000

Answer:

Protein

Step-by-step explanation:

The channels within the cell membrane are composed of three dimensional proteins that allow the passage of specific molecules or charged atoms

Karlgrz · Answer 2 · 2016-02-23T19:11:51+0000

All channels within the cell membrane are composed of pumps and proteins. Carrier proteins help in the movement of ions or molecules across cell membrane.

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