Membrane phospholipids are arranged in a bilayer with hydrophilic heads on the
outside and hydrophobic tails in the middle. What is the advantage of this
arrangement?
A.) the phospholipid heads can interact with water inside and outside the cell

B.) the phospholipid heads repeal water inside and outside the cell

C.) the bilayer will not let any materials pass through it

D.the bilayer forms a non- permeable barrier

The cell membrane is mostly composed of phospholipids which form a bilayer due to the properties of the phospholipids. The phospholipids are made up of phosphate heads, which are hydrophilic and attracted to water, and fatty acid tails, which are hydrophobic and repelled by water.

Due to these properties, a bilayer arrangement forms spontaneously, with the heads being attracted to the water both inside and outside the cell, and the tails being repelled by water and clustering together inside the bilayer

This regulates the passage of materials into and out of the membrane - some substances can easily pass, others are blocked from entering