Question

phospholipids, molecules found within a cell membrane, have hydrophobic tails and hydrophilic heads. these regions act in the same manner that hydrophobic and hydrophilic amino acids act. when phospholipids are found as a sphere in a glass of water, which of the following would you expect?
the hydrophobic tails will point toward the water, and the hydrophilic heads will point away from the water.
the hydrophobic tails and hydrophilic heads will be arranged randomly.
the hydrophilic heads will point toward the water, and the hydrophobic tails will point away from the water.
hydrophilic heads and hydrophobic tails will both point toward the water.

Explanation:

Hydrophilic ("water-loving") regions interact favorably with water, so they face the aqueous environment. Hydrophobic ("water-fearing") regions avoid water, so they point inward away from water. This arrangement minimizes energy and is stable.

Answer:

The hydrophilic heads will point toward the water, and the hydrophobic tails will point away from the water.