DNA and RNA are nucleic acids that has a sugar, phosphate group and bases in common.
Nucleic acids are macromolecules playing an essential roles in all cells and viruses.
A major function of nucleic acids involves the expression of genomic information. Deoxyribonucleic acid encodes the information cells need to make proteins.
Both DNA and RNA are constituted from nucleotides, each of these has a sugar backbone, a phosphate group, and a nitrogen base.
Thus, these are the molecules common in DNA and RNA.
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