Chemical Nature of Genes 



297 



FIGURE 33-4. Purines. Names of 

 purines found in DNA are underlined. 



ADENINE 

 (6-aminopurine) 



6-METHYLAMINOPURINE 



NH, 



2-METHYL ADENINE 

 (2-methyl-6-aminopurine) 



6-DIMETHYLAMINOPURINE 



H— Nf^ 



NH 



H— N 



X 



CH3— N^^N 

 H 



N 



2-METHYLAMINO GUANINE 



NH2 "N""^N 

 H 

 1 -METHYL GUANINE 



(2-amino-6-oxypurine) 



