What description best fits the class of molecules known as nucleotides?

The correct answer is – Nitrogenous base, phosphate group and a pentose sugar
Nucleotide is defined as a monomer constituting DNA or RNA biopolymer molecules. Each nucleotide consists of a nitrogenous heterocyclic base (nucleobase) which can be either a double ringed purine ring or a sing ringed pyrimidine. It also has a 5 carbon pentose sugar (deoxyribose in DNA or a ribose in RNA) and a phosphate group.

DNA and RNA are very important molecules and they cannot be formed with the nucleotide. Nucleotide are essentially the building block of DNA and RNA which are chains of genetic information. There are 5 forms of nucleotides. These are: Thymine, Uracil, Cytosine, Adenine and Guanine. Uracil is only found in RNA and Thymine is only present in DNA. The remaining nucleotides are present in both RNA and DNA.

Nucleotides will normally have a nitrogenous base, pentose sugar, and phosphate. If in case you are not familiar with what a nucleotide is, this is the building block of nucleic acid. RNA and DNA are made out of nucleotides that can normally be found in long chains. There are four types of nucleotides available.

These four are the following: adenine, thymine, guanine, and cytosine. Naming nucleotides can be a bit tricky when you do not know how to do it. Basically, you would need to base it on the number of phosphate residues that are available. For example, a nucleotide that contains two phosphates will be called adenosine diphosphate.