Which phenotype would be observed in an E. coli cell with the lacY- genotype?
A) Cells would not be able to accumulate lactose due to the absence of the lactose permease membrane protein.
B) Cells would not be able to accumulate lactose due to the presence of a defect in the fi- galactosidase gene.
C) Cells are able to cleave an indicator molecule even if lactose is absent as an inducer.
D) Cells are unable to cleave an indicator molecule even if lactose is available as an inducer.

Question

Quizplus · Accepted Answer

The lacY- genotype indicates that the E. coli cell is unable to produce the lactose permease membrane protein. This means that the cell cannot transport lactose into the cell, and therefore cannot utilize lactose as a carbon source.

Which Phenotype Would Be Observed in an E