. Î²-Galactosidase (lacZ) has bifunctional activity. It hydrolyzes lactose to galactose and glucose and catalyzes the intramolecular...

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Biology

. Î²-Galactosidase (lacZ) has bifunctional activity. Ithydrolyzes lactose to galactose and glucose and catalyzes theintramolecular isomerization of lactose to allolactose.Î²-Galactosidase promotes the isomerization by means of an acceptorsite that binds glucose after its cleavage from lactose and thusdelays its exit from the site. Allolactose, not lactose, is thenatural inducer for the lac operon. a. Would you expectÎ²-galactosidase to be induced in a zy+ mutant upon the addition oflactose? Upon the addition of allolactose? b. Would you expectÎ²-galactoside permease to be induced in a z+ y- mutant upon theaddition of lactose? Upon the addition of allolactose? c. Can yousuggest a reason why cells synthesize low levels of Î²-galactosidaseand permease even when there is absolutely no lactose in themedium?

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There are namely 2 genes here one is the lac Z that synthesisesthe galactosidase and another one is the lac Y that synthesises thepermease protein So in case of the ZY now the z shouldbe either or if the z is that means the the gene for thegalatosidase is present and it signifies that the See Answer

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