11.1 Nitrogenous bases含氮碱 Know the basic structures Pyrimidines(嘧啶) Cytosine胞~ODNA,RNA) Uracil尿~(RNA) Thymine胸~(DNA Purines(嘌呤) Adenine腺~(ODNA,RNA Guanine鸟~(DNA,RNA)
11.1 Nitrogenous Bases含氮碱 Know the basic structures • Pyrimidines (嘧啶） – Cytosine 胞~ (DNA, RNA) – Uracil 尿~ (RNA) – Thymine 胸~ (DNA) • Purines （嘌呤） – Adenine 腺~ (DNA, RNA) – Guanine 鸟~ (DNA, RNA)
6 5N7 3N N 6 4N9 H The pyrimidine ring The purine ring system
NH H N Cytosine Uracil (2-oxy-4-amino (2-oxy-4-oxy pyrimidine) pyrimidine) H N H Thymine (2-oxy-4-oxy 5-methyl pyrimidine)
NH H N N HoN N H Adenine Guanine (6-amino purine) (2-amino-6-oxy purine)
H tine次黄嘌呤 H Xanthine 黄嘌呤 H H Uric acid 尿酸
尿酸 黄嘌呤 次黄嘌呤