Question

how are phospholipid molecules arranged in the structure of the lipid bilayer?
select the correct answer below:
they are arranged with their hydrophobic tails facing each other and hydrophilic heads facing out.
they are arranged with their hydrophobic tails facing out and hydrophilic heads facing each other.
they are arranged with their hydrophilic tails facing each other and hydrophobic heads facing out
none of the above

Explanation:

Phospholipid molecules have a hydrophilic (water - loving) head and a hydrophobic (water - fearing) tail. In an aqueous environment (like the cell's interior and exterior which are mostly water), the hydrophilic heads will face the water (outwards) to interact with it, and the hydrophobic tails will face each other to avoid water.

Answer:

They are arranged with their hydrophobic tails facing each other and hydrophilic heads facing out.