When scientists were attempting to determine the structure of the genetic code,Crick and coworkers found that when three base additions or three base deletions occurred in a single gene,the wild- type phenotype was sometimes restored.These data supported the hypothesis that_________ .
A)the code is triplet B)the code contains internal punctuation C)there are three amino acids per base D)the code is overlapping E)AUG is the initiating triplet