11. The lacZ gene encodes beta-galactosidase. X-Gal. green florescent protein. D

Question

11. The lacZ gene encodes beta-galactosidase. X-Gal. green florescent protein. DNA ligase. a protein that confers antibiotic resistance. 12. The expression of the lac structural genes is _______ when lactose is absent from the culture medium and is _______ when lactose is added because lactose binds to the _______ and inactivates it. low; high; lac repressor high; low; lac inducer low; high; lac promoter high; low; lac operator low; high; lac operator 13. An operon is a molecule that can turn genes on and off. an inducer bound to a repressor. a series of regulatory sequences controlling transcription of protein-coding genes. any long sequence of DNA. a promoter, an operator, and a group of linked structural genes. 11. The lacZ gene encodes beta-galactosidase. X-Gal. green florescent protein. DNA ligase. a protein that confers antibiotic resistance.

Explanation / Answer

11.Lac Z encodes for beta- galactosidase.

12.The expression of the lac structural genes is LOW when lactose is absent from the culture medium and is HIGH when lactose is added because lactose binds to the Lac REPRESSOR and inactivates it.

13. Operon is a promotor, an operator, and a group of linked structural genes.

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