What does Deoxyribonucleic Acid primarily consist of?

Deoxyribonucleic Acid, or DNA, is primarily composed of nucleotides, which are the building blocks of genetic material. Each nucleotide consists of a sugar molecule (deoxyribose), a phosphate group, and a nitrogenous base. The sequence of these nucleotides encodes genetic information that determines the characteristics of living organisms and guides the synthesis of proteins. This genetic information is organized into genes, which are segments of DNA that provide instructions for making proteins, playing a crucial role in heredity and biological functioning. Thus, the correct answer emphasizes the significance of DNA as the molecular basis for genetics. The other choices incorrectly attribute functions or components that do not pertain directly to DNA.