Question

the molecule shown in the figure is a(n) ...
polysaccharide.
saturated fatty acid.
triacylglycerol.
unsaturated fatty acid.

Explanation:

Polysaccharides are polymers of sugar monomers, which this is not. Saturated fatty - acids have no carbon - carbon double bonds. Triacylglycerols are composed of glycerol and fatty acids and have a different structure. This molecule has carbon - carbon double bonds and a carboxyl group at one end, characteristic of an unsaturated fatty acid.

Answer:

unsaturated fatty acid