Introduction to Nucleotides and Nucleic Acids N N N N N N 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 Purine Pyrimidine O OH HO CH 2 HO Base 1´ 2´ 3´ 4´ 5´ Nucleoside 1´ 2´ 3´ 4´ 5´ Nucleotide Monophosphate 1´ 2´ 3´ 4´ 5´ 2´-Deoxyribonucleotide Monophosphate P O O O O O HO CH 2 Base P O O O O O OH HO CH 2 Base N N N H N NH 2 HN N N H N O H 2 N N H N O NH 2 Adenine Guanine Cytosine Thymine Uracil B a s e N u c l e o t i d e P u r i n e s P y r i m i d i n e s B a s e N u c l e o t i d e Adenosine Guanosine Cytidine Uridine Thymidine N H NH O O N H NH O O H 3 C N N N H N O HN N H N H N O O HN N H N H H N O O O HN NH O O N N N N O O CH 3 H 3 C CH 3 Hypoxanthine Xanthine Uric acid Pseudouracil 1,3,7-Trimethyl xanthine