The lac operon contains three genes: lacZ, lacY, and lacA (for ?-galactosidase,

Question

The lac operon contains three genes: lacZ, lacY, and lacA (for ?-galactosidase, galactoside permease, and thiogalactoside transacetylase, respectively). The operon also contains a promoter site and an operator site. The regulatory gene includes the I gene for the Lac repressor protein and a promoter for that gene.

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The lac operon contains three genes: lacZ, lacY, and lacA (for galactosidase, galactoside permease, and thiogalactoside transacetylase, respectively). The operon also contains a promoter site and an operator site. The regulatory gene includes the I gene for the Lac repressor protein and a promoter for that gene regulatory gene lac operon DNA P lacl gene P O acz gene acY gene acA gene The lac operon undergoes negative regulation. In the normal condition, the Lac repressor protein is active. Allolactose, an isomer of lactose, is the signal molecule that binds to the Lac repressor. Determine which events will increase the concentration of gene products and which will decrease the concentration of lad c gene products. Increase in gene products Decrease in gene products The Lac repressor The Igene Allolactose binds Allolactose is The Lac repressor Lactose is not present dissociates from DNA. present in the cell. remains bound to the operator is disab to the Lac repressor protein.in the cell

Explanation / Answer

Increase in gene products:

- The I gene is disabled

- Allolactose binds to the lac repressor protein

- The lac repressor dissociates from DNA
- lactose is present in the cell

Decrease in gene products:

- The lac repressor remains bound to the operator

- Allolactose is not present in the cell

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