Question
In lac operon, the inducer binds to to initiate the synthesis of enzymes responsible for lactose metabolism.(a) i gene(b) Repressor(c) O gene(d) $Z$ gene
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When lactose is available, some molecules of it are converted into allolactose. Show more…
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In Escherichia coli, the lac operon is induced by: (a) lactose (b) promoter gene (c) β-galactosidase (d) I-gene
The lac operon of E. coli contains several genes. The lac z gene codes for an enzyme called ?-galactosidase. What is the function of ?-galactosidase in lactose metabolism? A. It catalyzes the production of cAMP from ATP B. It converts galactose to glucose C. It brings lactose into the cell for metabolism D. It hydrolyzes lactose into glucose and galactose E. It activates both the lac permease and adenylate cyclase
The lac operon in E. coli controls the gene expression of the enzymes that digest lactose in the cell. In the presence of lactose, the lac operon will turn on and the genes will be expressed. Place the events of gene regulation by the lac operon in order of their occurrence, from the introduction of lactose to the environment to when the cell begins to digest lactose. A. The repressor is removed from the operator. B. RNA polymerase binds to the promoter region. C. Lactose enzyme genes are expressed by the operon. D. The regulatory gene expresses the repressor protein. E. The repressor is inactivated by lactose.
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