This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of Purines and Pyrimidines, Subject name: Biochemistry
[{'content': 'About purine and pyrimidine nucleotides, all are true except- \nSelect and explain. \nA. Uracil is not found in DNA, B. Thymine is not found in RNA, C. Adenosine is a nucleotide, D. Adenine is present in both DNA and RNA', 'role': 'user'}, {'content': "Answer: C \nExplanation: 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 (A)Guanine (G)Uracil (U)Cytosine (C)AdenosineGuanosineUridineCytidineAdenosine monophosphate (AMP)Guanosine monophosphate (GMP)Uridine monophosphate (UMP)Cytidine (Monophosphate) (CMP)BaseDeoxy ribonucleosideDeoxyribonucleotideAdenineGuanineCytosineThymineDeoxyadenosineDeoxyguanosineDeoxycytidineDeoxythymidineDeoxyadenosine monophosphate (dAMP)Deoxyguanosine monphosphate (dGMP)Deoxycytidine monophosphate (dCMP)Deoxythymidine monophosphate (dCMP)o Thus adenosine is a nucleoside (not nucleotide)Nucleoside= Nitrogenous base (purine or pyrimidine) + Pentose sugar (ribose or deoxyribose)Nucleotide= Nucleoside + phosphate group (phosphoric acid)or= Nitrogenous base + Pentose sugar + Phosphate group", 'role': 'assistant'}]