Hydrogen cyanide and carbon monoxide are poisons that easily penetrate the plasma membrane. Why did not one of the cells develop adaptations that impede the entry of these substances into the cell?
Both gases of the substance are low molecular weight, both of which are weakly polar (practically nonpolar). Therefore, they easily dissolve in the phospholipid bilayer of the membrane and freely diffuse along the concentration gradient into the cell. To obstruct their penetration, it would be necessary to fundamentally change the structure of the membrane.
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