Answer:
- Fatty Acids
- carboxyl group
Step-by-step explanation:
Lipids are compounds with varying molecular structure, having several organic functions: energy reserve (energy source for hibernating animals), thermal insulation (mammals), and collaborate in the composition of the plasma membrane of cells (phospholipids).
Lipids are substances whose main characteristic is insolubility in polar solvents and solubility in organic (nonpolar) solvents, presenting hydrophobic nature, that is, aversion to the water molecule. This is due to the composition of the lipids, as they are formed by fatty acids and carboxyl group.