Adenine NH2 N- EN Nucleobase N° `H || -0CH2 но— Р Deoxyribose (5-carbon sugar) OH Phosphate group OH H FIGURE 2.25 A Nucleotide This is one subunit of DNA. This subunit is called adenylic acid or deoxyadenosine-5'-phosphate because the nucleobase is adenine. If the nucleotide lacks the phosphate group, it is called a nucleoside-in this case, deoxyadenosine.

It is an organic molecule made up of three basic components- a nitrogenous base, phosphate,and pentose sugar. The nucleotides are important for metabolic reactions andthe formation of DNA (deoxyribonucleic acid) and RNA (ribonucleic acid).

Nucleic acids are essential biomolecules present in prokaryotic and eukaryotic cells and viruses. They carry the genetic information for the synthesis of proteins and cellular replication. The nucleic acids are of two types: deoxyribonucleic acid (DNA) a…