An artificial nucleobase sounds cool! I would love to see what types of structures and processes it could do. Uracil is unique and can bond to other uracils in RNA giving it the ability to differentiate its structure for survival purposes. Methylation is a defense mechanism from an enzyme found in some bacteria and viruses (nucleases) and all DNA are methylated. In transcription RNA is used which used Uracil instead of Thymine during the synthesis of DNA the uracil is methylated by folic acid which converts it to thymine. The bases (A-T) bond through hydrogen bonding. To have a structural piece of DNA or RNA the nucleotides consist of a nucleic acid (differing Uracil in RNA from Thymine in DNA) a deoxygenized sugar (DNA) or oxygenized sugar (RNA) and a monophosphate (PO4) The bases are the 3 structures (nucleic acid, ribose and phosphate) bond together with a strong bond called a phosphodiester bond.
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