Final answer:
The parts of a triglyceride molecule are glycerol and three fatty acids, bonded by ester bonds formed through dehydration synthesis.
Step-by-step explanation:
The correct identification of the parts of a triglyceride molecule is 1) Glycerol and three fatty acids. A triglyceride molecule consists of a glycerol backbone bonded to three fatty acids. The glycerol molecule, an organic compound, contains three carbons and three hydroxyl (OH) groups. Each of the three fatty acids, which are long chains of hydrocarbons with a carboxyl group at one end and a methyl group at the other, is bonded to the glycerol at each OH group through a process known as dehydration synthesis. This process involves the removal of water, as glycerol gives up a hydrogen atom and the fatty acids give up a hydroxyl group, forming an ester bond between them.