ROLE OF NUCLEIC ACIDS 



83 



ribosenucleic acids carrying genetic information for the synthesis of 

 proteins do exist in cells. However, they point towards directions where 

 such evidence should be sought. 



DNA COMPOSITION IN DIFFERENT BACTERIA 



Abbreviations: G = guanine; A = adenine; C = cytosine; T = thymine; 

 Pur. = purine bases; Pyr. = pyrimidine bases. 



Fig. 24. (Belozersky, 1959). 



(b) Is cytoplasmic RNA made in close contact with DNA? The pathways 

 of RNA synthesis remain very obscure. It is true that Grunberg-Manago 

 and Ochoa (1955) discovered an enzyme which catalyses the condensation 



