Understand that DNA, or deoxyribonucleic acid, is a molecule that carries genetic information in living organisms.
Recognize that the building blocks of DNA are nucleotides, which are composed of three components: a phosphate group, a sugar molecule (deoxyribose), and a nitrogenous base.
Differentiate between the options given: amino acids are the building blocks of proteins, monosaccharides are simple sugars and the building blocks of carbohydrates, and fatty acids are components of lipids.
Identify that nucleotides are the correct building blocks of DNA, as they form the long chains that make up the DNA structure through phosphodiester bonds.
Conclude that the correct answer to the question is nucleotides, as they are the fundamental units that construct the DNA molecule.