Final answer:
Nucleotides consist of a. a nitrogenous base, a phosphate group, and a pentose sugar, and they serve as the building blocks of DNA and RNA.
Step-by-step explanation:
The class of molecules known as nucleotides best fits the description of a nitrogenous base, a phosphate group, and a sugar. Nucleotides are the building blocks of nucleic acids like DNA and RNA. Each nucleotide consists of three components: one or more phosphate groups, a pentose sugar (which can be either deoxyribose for DNA or ribose for RNA), and a nitrogen-containing base (which can be a purine like adenine or guanine, or a pyrimidine like cytosine, thymine, or uracil).
The class of molecules known as nucleotides can be described as a nitrogenous base, a phosphate group, and a sugar. Nucleotides are the building blocks of nucleic acids, which include DNA and RNA. The nitrogenous base can be one of several options, such as adenine, cytosine, guanine, thymine, or uracil.