A paricular operonencodes enzymes that together manufacture an essential amino acid.If the regulation of this operon is like that of the trp operonthen?
a. the amino acid acts as a corepressor.
b. the enzymes produced are called inducible enzymes.
c. the amino acid turns on enzyme synthesis
d. the amino acid inactivates the repressor
e. the repressor binds to the operator in the absence of the aminoacid.