THE CHEMICAL BASIS OF HEREDITY 



H 



Ni 



,C — N 



H — C2 5C- 



\ 



-N 



9/ 



-N— 



C— H 



-05 H 



rc— H 



H— C— H 



OH H 



.OH 



/ 



o^\ 



Monomers of the 

 RNA chain 



Adenylic acid 



N — C2 5C- 



/ 



-N. 



9/ 



-N— 



C — H 



N,==C — N 



0=C2 5C — H 



N^ ^C — H 



0^C2 5C — H 



H 



,0. 



c — c \ 



OH H 



H— C— H 

 0- 



.OH 



/ 



o/\ 



H 



,0. 



V 1/ 



c — c 



OH H 



C. — H 



H— C— H 



/ 



OH 



/ 



o'\ 



Guanylic acid 



Cytidylic acid 



H 



-O. 



c — c \ 



I I H— C — H 



OH H I 



P 



OH 



V 



Uridylic acid 



1.1b. Structural formulae of the principal nucleotides of RNA. 



