what are two main parts of a lipid?
['Fats and oils. A fat molecule consists of two kinds of parts: a glycerol backbone and three fatty acid tails. ... ', 'Saturated and unsaturated fatty acids. As shown in the example above, the three fatty acid tails of a triglyceride need not be identical to each other. ... ', 'Waxes. ... ', 'Phospholipids.']