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

Question

A) channel

B) marker

C) receptor

D) hormone

Answer 1

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.