(a) The “T” in the base sequence would be substituted into “U”.
(c) The base sequence inserted into E. coli is not the only one that codes for ∂-nex-endorphin because one amino acid can code more than one condon. Thus, there are more codes as the genetic code is apparent to be degenerate.
(d) The amino acid sequence is modified, after translation, to produce the final form of ∂-neo-endorphin by the removal of an amino acid. This is processed during the process of translation and transcription.