Which statement must be mentioned in explaining why amphipathic molecules line up at a water surface? which statement must be mentioned in explaining why amphipathic molecules line up at a water surface?
a. nonpolar groups repel water.
b. nonpolar groups attract one another.
c. polar groups attract one another.
d. polar groups repel water.
e. all of the above.

Option (C) is the correct answer.

Explanation:

An amphipathic molecules is defined as the molecule that contains both polar and non-polar parts.

For example, phospholipids are amphipathic molecules as they contain non-polar fatty acids known as tails and polar phosphate known as heads.

In amphipathic molecules, the polar water molecules tend to pull towards each other. As a result, non-polar parts tend to move away into the air.

Therefore, we can conclude that amphipathic molecules line up at a water surface because polar groups attract one another.