Protons are unable to cross the lipid bilayer because a the

Protons are unable to cross the lipid bilayer because:

a) the lipid bilayer is too hydrophillic

b) protons are nonpolar

c) protons are too small

d) the lipid bilayer is only permeable to polar substances

e) none of the above

Solution

d) the lipid bilayer is only permeable to polar substances because protons is a polar substance which can easily through the lipid bilayer.This is the main reason that this layer is permeable to such substanced and it allows it to pass through.