BIOSYNTHESIS OF PROTEINS 



283 



has tried to show that in tobacco mosaic \irus there is some 

 correlation between the content of nucleotides of the viral 

 RNA and that of amino acids of the viral protein. For 



♦ 



W 



c 



/ 



/[■ 



y 



N C \ / 



H — C — H 



\J M 



W .0/ 



4 



* 



♦ 



/ 



c 



/ 



II " 



H 



/ 



N C 



// w 



\ 



c- 



-/ 



H — C — H 



H H— C -H 





\ 



o- 



\ 



Fig. 26. Triads of nucleotides (after Gamow). 



example, valine is supposed to correspond to the combination 

 adenylic acid, cytidylic acid, uridylic acid, tyrosine to adeny- 

 lic, adenylic, adenylic acid, etc. However, if we do the same 

 calculations for turnip yellows virus, the correspondence 



