<prompt> About purine and pyrimidine nucleotides, all are true except-Uracil is not found in DNAThymine is not found in RNAAdenosine is a nucleotideAdenine is present in both DNA and RNA  <response>: Ans. is c i.e., Adenosine is a nucleotide o Two types of bases are found in nucleotides : i purines and ii pyrimidines.i Purines : Two major purine bases found both in DNAs as well as RNAs are i adenine A and ii guanine G.ii Pyrimidines: Three major pyrimidine bases are i cytosine C, ii Uracil U and iii Thymine T. Cytosine and uracil are found in RNAs and cytosine and thymine are found in DNAs. Uracil is notfound in DNAs Q and thymine is not found in RNAs.Different major bases with their corresponding nucleosides and nucleotidesBaseRibonucleosideRibonucleotideAdenine AGuanine GUracil UCytosine CAdenosineGuanosineUridineCytidineAdenosine monophosphate AMPGuanosine monophosphate GMPUridine monophosphate UMPCytidine Monophosphate CMPBaseDeoxy ribonucleosideDeoxyribonucleotideAdenineGuanineCytosineThymineDeoxyadenosineDeoxyguanosineDeoxycytidineDeoxythymidineDeoxyadenosine monophosphate dAMPDeoxyguanosine monphosphate dGMPDeoxycytidine monophosphate dCMPDeoxythymidine monophosphate dCMPo Thus adenosine is a nucleoside not nucleotideNucleoside Nitrogenous base purine or pyrimidine Pentose sugar ribose or deoxyriboseNucleotide Nucleoside phosphate group phosphoric acidor Nitrogenous base Pentose sugar Phosphate group 