The inducer of the lac operon is lactose.

The lac operon is expressed when

Which of the following is the inducer of the lac operon in cells? Group of answer choiceslactose allolactosegalactoseglucoseisopropylthiogalactopyranoside

Lactose or its analogues act as positive regulators of Lac operon by:Select one:a. Binding to repressor subunits so that the repressor cannot attached to operator locus.b. Attaching to I gene and preventing its expressionc. Attaching to promoter region and facilitating the biding of RNA polymerased. Increasing the synthesis of catabolic gene activator protein.Clear my choice

4. What molecule serves as an inducer of the lac operon?a) Lactosec) Allolactoseb)e) lacl

The lac operon system, first described by Jacob and Monod, regulates lactose metabolism in . The is composed of a gene encoding a protein that normally keeps this operon in the position. Within the , the repressor binds to the , blocking transcription of structural genes needed for lactose metabolism. When is added to a cell's environment, it binds the repressor freeing the operator segment of the DNA. is now able to bind to the promoter, transcribing all three structural genes needed for lactose catabolism. When lactose again becomes depleted in the cell, the repressor binds to the operator blocking additional synthesis of enzymes from the .