| H. Gobind Khorana was able to synthesize small repeating nucleotides for use in these experiments. Polynucleotide Phosphorylase 
         would also link di-, tri-, and tetra-nucleotides together to form repeating 
         copolymers 
           
             
               | Repeatin g Sequenc e  | Polynucleotides  | Repeating Triplets  |  
               | UG  | UGUGUGUGUGUGUGUGUGUGUG  | UGUGUG
 |  
               | UUG  | UUGUUGUUGUUGUUGUUGUUG  | UUGUGU
 GUU
 |  
               | UACG  | UACGUACGUACGUACGUACGUACG  | UACGUA
 CGU
 ACG
 |    
           
             
               | Repeating Copolymer  | Codons Produced  | Amino Acids in Polypeptide  |  
               | UG  | UGUGUG
 | CysteineValine
 |  
               | AC  | ACACAC
 | ThreonineHistidine
 |  
               | UUC  | UUCUCU
 CUU
 | PhenylalanineSerine
 Leucine
 |  
               | AUC  | AUCUCA
 CAU
 | IsoleucineSerine
 Histidine
 |  
               | UAC  | UAUCAU
 UCU
 AUC
 | TyrosineLeucine
 Serine
 Isoleucine
 |  
               | GAUA  | GAUAGA
 UAG
 AUA
 | None  |  Note: that this is one of the independent proofs of the triplet code. The other proof was from Francis Crick.    |