The cell membrane is selectively permeable. O2 diffuses across the phospholipid bilayer. K+ must cross the cell membrane using a membrane protein. Which property of the cell membrane prevents the diffusion of K+? A) The membrane proteins are attracted to the charged ions. B) Only very small particles are able to diffuse across the cell membrane. C) The lipid tails are hydrophobic, repelling charged ions such as K+. D) The phosphate heads are hydrophobic and prevent the passage of polar substances.
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