Similar to the trp operon, the genes encoding proteins for

/in /by

Similar to the trp operon, the genes encoding proteins for histidine synthesis are in a his operon that is under attenuation control.
Select one:
a. The his operon leader sequence probably contains several His codons in a row
b. Does not contains adjacent codons for histidine.
c. It is impossible to predict what codons are in the leader sequence
d. contains adjacent codons for tryptophan.