A)galactose.
B)glucose.
C)allolactose.
D)repressor protein.
E)permease.

A)To have its genome replicated
B)To kill its host cell
C)To make more of the Cro protein
D)To be more efficient in its use of resources
E)To escape an endangered host cell

A)a lack of tryptophan causes stalling of ribosomes on the leader sequence of the RNA.
B)an RNA stem-loop forms that allows transcription to continue.
C)an RNA stem-loop that causes transcription to terminate fails to form.
D)the cell has enough tryptophan.
E)the operator is mutated.