H H C C N n3 5Ch C 7V 8 CH HC2 6CH HC2,4C、9 Pyrimidine Purine
Figure 10-2 NH2 HN CH CH HC H H2N H Adenine Guanine Purines NH O C CHs N CH HN HN CH CH CH CH N H H H Cytosine Thymine Uracil (DNA) (RNA) Pyrimidines
Figure 10-2
Figure 10-3 H C=0 OH HC—OH CH2O、OH H-C-OH HH H H H-C-OH OHOH CHOH Aldehyde β- Furanose (a)
Figure 10-3
5 5 4 C-3 endo C-2 endo Base Base C-3 exo C-2
table 10-1 Nucleotide and nucleic Acid nomenclature Base Nucleoside* Nucleotide* Nucleic acid Purines Adenine Adenosine Adenylate RNA Deoxyadenosine Deoxyadenylate DNA Guanine Guanosine Guanylate RNA Deoxyguanosine Deoxyguanylate DNA Pyrimidines Cytosine Cytidine Cytidylate RNA Deoxycytidine Deoxycytidylate DNA Thymine Thymidine or Thymidylate or DNA deoxythymidine deoxythymidylate Uracil Uridine Uridylate RNA Nucleoside and nucleotide are generic terms that include both ribo- and deoxyribo- forms. Note that here ribonucleosides and ribonucleotides are designated simply as nucleosides and nucle- otides(e. g, riboadenosine as adenosine), and deoxyribonucleosides and deoxyribonucleotides as deoxynucleosides and deoxynucleotides (e. g, deoxyriboadenosine as deoxyadenosine). Both forms of naming are acceptable, but the shortened names are more commonly used Thymine is an exception; the name ribothymidine is used to describe its unusual occurrence in RNA