Question

The lipid bilayer of cell membrane is impermeable to

• A. large uncharged polar molecules
• B. small uncharged polar molecules
• C. hydrophobic molecules
• D. hydrophilic molecules

Answer 1

The correct option is A large uncharged polar molecules

• The lipid bilayer of the cell membrane is permeable to small hydrophobic molecules and small uncharged polar molecules.
  
• It is slightly permeable to water and urea.
• It is impermeable to ions and large uncharged polar molecules.

So, the correct option is ' Large uncharged polar molecules'.