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The cell membrane is selectively permeable. Which type of membrane protein best illustrates this concept?

A) channel
B) marker
C) receptor
D) hormone
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1 Answer

Selective permeable means that the membrane only allows certain substances into the cell, such as water and oxygen.  In order to do that, the membrane needs to place a marker on those substances so that it can distinguish what to let in and what to keep out.  Kind of like a label.