The permease of E. coli that transports an alpha-galactoside known as melibiose can also transport lactose, but the melibiose permease is temperature sensitive: Lactose can be transported into the cell by the melibiose permease at 30 ° C but not at 37 ° C.
In a strain that produces the melibiose permease constitutively, what are the phenotypes of lacZ and lacY mutants at 30 ° C and 37 ° C?
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