Question

Phospholipid molecules in a membrane are arranged with theiron the exterior and theiron the interior O a hydrophobic heads hydrophilic tails Ob d hydrophilic heads hydrophobic tails hydrophobic tailshydrophilic heads nonpolar headspolar tails

Answer 1

In a phospholipid bilayer, the phospholipid molecules are arranged with their **hydrophilic (water-attracting) heads** facing outward towards the aqueous environment, while their **hydrophobic (water-repelling) tails** face inward, away from the water.

So the correct arrangement is:

**b**: hydrophilic heads (on the exterior), hydrophobic tails (on the interior).

This arrangement helps to create a semi-permeable membrane that allows for the formation of cellular structures.