THE CHEMICAL BASIS OF HEREDITY 



TABLE 1.1 

 Chemical Relationships of DNA's and RNA'S 



DNA Polynucleotide Chains RNA 



Nitrogen base — deoxyribose — O — P 



OH 



Nitrogen base — deoxyribose — O — P 



nitrogen base — ribose — O — P 



nitrogen base— ribose — O — P 



OH 



Nitrogen bases 



Adenine 

 Guanine 



purines 



pyrimidines 



Cytosine 

 Thymine 



NucIeosides(nitrogenbase + sugar) 

 Deoxyadenosine 

 Deoxyguanosine 

 Deoxycytidine 

 Deoxythvmidine 



Nucleotides (nitrogen base + sugar + phosphoric acid) 

 Deoxyriboadenylic acid 

 Deoxyriboguanylic acid 

 Deoxyribocytidylic acid 

 Deoxyribothymidylic acid 



adenine 

 guanine 



cytosine 



adenosine 

 guanosine 

 cytidine 

 uridine 



adenylic acid 

 guanylic acid 

 cytidvlic acid 

 uridylic acid 



OH 



ships are summarized in Table 1.1 and structural formulae are given in 

 Figure 1.1. 



In addition to the eight common nucleotides listed here, a number 

 of special constituents have been found in the nucleic acids of particular 



