Question

the cell membrane consists of two layers of phospholipids. the head of each phospholipid is made of a phosphate group, a molecule that is negatively charged and polar. this makes the head hydrophilic, or water loving, so it is attracted to other polar molecules like water. the tails are uncharged, nonpolar fatty acid chains. they are hydrophobic, or water fearing, so they repel most polar molecules. complete the paragraph to describe the phospholipid bilayer. both the intracellular and extracellular environments contain water. the water the phosphate - containing heads and the fatty acid tails of the phospholipids. so the heads of the phospholipids face, and the tails face in the lipid bilayer.

Explanation:

The text states that the phosphate - containing heads are hydrophilic (water - loving) and the fatty acid tails are hydrophobic (water - fearing). Since both the intracellular and extracellular environments contain water, hydrophilic heads will be attracted to water and hydrophobic tails will be repelled by water. In the phospholipid bilayer, the heads will face the watery environments (intracellular and extracellular) and the tails will face each other (away from water).

Answer:

attracts; repels; the intracellular and extracellular environments; each other