How are phospholipids formed?

Phospholipids are formed through the process of substituting a phosphate group in triglycerides. Triglycerides are composed of glycerol and three fatty acids. In the case of phospholipids, one of the fatty acid chains is replaced with a phosphate group. This structural modification gives phospholipids their unique amphipathic properties, meaning they have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts. The presence of the phosphate group allows phospholipids to form bilayers that are fundamental components of cell membranes, providing a barrier to small polar molecules while allowing the passage of nonpolar substances.

The other options do not accurately represent the structural formation of phospholipids, as they either involve incorrect combinations of molecules or focus on processes that do not lead to the formation of phospholipids.