Which statement about phospholipids is true?
Heads of phospholipids are hydrophobic.
Phospholipids allow any particle to freely pass through the phospholipid bilayer.
Tails of phospholipids are hydrophobic.
Phospholipids do not allow small particles to freely pass through the phospholipid bilayer.

The correct answer is 'Tails of phospholipids are hydrophobic'. Phospholipids are an essential constituent of cell membranes. They have a hydrophillic head and two hydrophobic tails. Hydrophillic means water loving or attracted to water and hydrophobic means water repelling. The function of this molecule is to create the cell membrane and to allow it to take different shapes in different cellular conditions.