What codes for the amino acid sequence of the enzyme

What codes for the amino acid sequence of the enzyme?
A.  regulator gene
B.  promoter gene
C.  operator gene
D.  structural gene
E.  repressor


Synthesis of tryptophan can be repressed in bacteria.  The repressor protein of the tryptophan operon
A.  may be activated by the binding of tryptophan.
B.  may be inactivated by the binding of tryptophan.
C.  may be activated by the binding of charged tryptophanyl tRNAtrp.
D.  may be activated by the binding of uncharged tRNAtrp.


Which of the following mutations would most likely alter the amount of a protein but not its primary structure?
A. missense mutation
B. splicing mutation
C. reverse terminator mutation
D. nonsense mutation
E. promoter mutation