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Sagot :
It is difficult for molecules to pass through the phospholipid bilayer because like attracts like. The polar molecules are not able to enter the membrane due to attraction between polar molecules outside the membrane. Likewise, the non-polar molecules are not able to cross the membrane after entering. Therefore, no molecules can cross the membrane.
Phospholipid bilayer is the membrane composed of two layers of lipids surrounding the cell. The polar heads of the lipids are placed on the outer side, whereas the non-polar hydrophobic tails are all placed inside, away from the solvent molecules.
Polar molecules are those that have a positive charge at one end while negative on the other. For example HF is a polar molecule with H being slightly positive and F being slightly negative.
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