Question

Are the phosphate heads of the membrane (the phospholipid bilayer) polar or nonpolar?


Polar


Nonpolar

Answer 1

The phosphate heads of the membrane (the phospholipid bilayer) are polar. This polarity allows them to interact with the aqueous environments both inside and outside the cell, while the fatty acid tails of the phospholipids are nonpolar and hydrophobic, which helps to create a barrier that separates the internal environment of the cell from the external environment.