Final answer:
A lipid molecule can bind to form a diacylglycerol when a water molecule is removed. However, the presence of a modified phosphate group turns diacylglycerol into phosphatidate, the precursor of phospholipids.
Step-by-step explanation:
When a water molecule is removed, a lipid molecule can bind to form a diacylglycerol. Diacylglycerol is formed when two fatty acids are bonded to a glycerol molecule. It is a precursor of triglycerides and phospholipids. However, it should be noted that the presence of a modified phosphate group turns diacylglycerol into phosphatidate, the precursor of phospholipids.