Nucleic Acids are macromolecules made up of nucleotides which consists of a five-carbon sugar covalently bonded to a nitrogenous base and one or more phosphate groups.
DNA stands for deoxyribonucleic acid and has a double helix, deoxyribose sugar, function (code for protein), and AGCT are its nitrogenous bases.
RNA stands for ribonucleic acid and has a single helix, ribose sugar, function (copied directions for proteins, and AUCG are its nitrogenous bases.
Lipids are the one class of large biological molecules that does not include true polymers, and they are generally not big enough to be considered macromolecules. They mix poorly with water and are made up of glycerol and fatty acids.
A saturated fatty acid is saturated with hydrogen and has only single bonds among the carbons. As a unsaturated fatty acid has one or more double bonds, with one fewer hydrogen atom on each double-bonded carbon.