A phospholipid molecule is built on a backbone of:

1. Every phospholipid has the same underlying frame. 2. That frame carries three carbons. 3. A phospholipid molecule consists of a three-carbon glycerol backbone. 4. Two fatty acids attach at carbons 1 and 2, and a phosphate-containing group at the third. _Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 5 'Structure and Function of Plasma Membranes', sections 5.1-5.4_