Gene Action and Amino Acid Coding 



431 



Nucleus 

 CGAACGUACUCA 



GCTTGCATGAGT 

 CGAACGTACTCA 



GCUUGCAUGAGU 



/////// 



i I'^i 



Ig 



C G A 



A C G 



MESSENGER 

 RNA 



TRANSFER RNA? 

 RIBOSOMAL RNA? 



AMINO ACIDS 



+ 



TRANSFER 

 RNA 



AMINO ACID- 

 TRANSFER 

 RNA COMPLEX 



AMINO 



///mmm acid 



CHAIN 



FIGURE 47-2. Hypothesized rela- 

 tion between DNA ( — ) and nuclear 

 and cytoplasmic RNA ( — ). 



