Mutations in any of the genes involved
in lac operon will lead to loss of
functionality. What is the effect on the operon if
the lac promoter is mutated?
A)
RNA polymerase is unable to bind to the DNA upstream of
the lac operon, and
the lacZ and lacY genes are
not be transcribed, even in the absence of the inducer
(lactose).
B)
RNA polymerase is unable to bind to the DNA upstream of
the lac operon, and
the lacZ and lacY genes are
not be transcribed, even in the presence of the inducer
(lactose).
C)
The lacY gene will be continuously
transcribed, even in the absence of the inducer (lactose).
D)
The lacZ gene will be continuously
transcribed, even in the absence of the inducer (lactose).