The phospholipids of the cell membrane have a polar hydrophilie (water- loving/attracting) head and two nonpolar hydrophobic (water- fearing/repelling) tails. The head of a phospholipid is made of a glycerol and phosphate group, while the tails are made of two chains of fatty acids. 4. Define hydrophilic. 5. Define hydrophobic. 6. Based on the paragraph above, fill in the characteristics of the phospholipid heads and tails below: Characteristics Phospholipid Heads Phospholipid Tails Hydrophilic or hydrophobic? Polar or nonpolar? What is it made of?