Molecules that resemble fats but contain phosphate functional groups are called phospholipids.

Here's why:

* Fats (or triglycerides) are composed of glycerol (a three-carbon alcohol) and three fatty acid chains.

* Phospholipids also have glycerol and two fatty acid chains, but the third carbon on glycerol is attached to a phosphate group instead of a fatty acid. This phosphate group can be further linked to other molecules.

The presence of the phosphate group gives phospholipids several key properties:

* Amphipathic: They have both hydrophobic (water-repelling) and hydrophilic (water-attracting) regions. The fatty acid tails are hydrophobic, while the phosphate head is hydrophilic.

* Essential for cell membranes: This amphipathic nature allows phospholipids to form the basis of cell membranes, creating a barrier between the cell and its surroundings.

Let me know if you'd like to learn more about phospholipids!