On its chromosome, an E. coli cell has the genotype lacI lacZ+ lacY+ lacA+. It has an
Question:
On its chromosome, an E. coli cell has the genotype lacI− lacZ+ lacY+ lacA+. It has an F′ factor with the genotype lacI+ lacZ+ lacY+ lacA+. What is the expected level of expression of the lac operon genes (lacZ+ lacY+ lacA+) in the absence of lactose?
a. Both lac operons will be expressed.
b. Neither lac operon will be expressed.
c. Only the chromosomal lac operon will be expressed.
d. Only the lac operon on the F′ factor will be expressed.
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In the absence of lactose the lac operon is normally repressed by the LacI repressor The LacI repres...View the full answer
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