The ability of a cell membrane to allow hydrophilic molecules to pass into a cell is determined by:

A.	peripheral membrane proteins.
B.	integral membrane proteins. Integral membrane proteins can form pores through the cell membrane. The channel is composed of protein, frequently with hydrophobic amino acids directed towards the lipid and hydrophilic amino acids inside the pore to interact with the transported hydrophilic molecule.
C.	peripheral membrane carbohydrates.
D.	integral membrane carbohydrates.
E.	peripheral membrane lipids.