Besides the lac operon, which other operons are subject to catabolite repression?Select your answer:Select your answerOPTION ALTERNATIVE Those involved in DNA replication. Those involved in protein degradation. Those involved in catabolism. Those involved in lipid synthesis.

Besides the lac operon, which other operons are subject to catabolite repression?

1. Which of the following best describes the role of catabolite repression in microbial metabolism?Question 1Answera.Prevents the synthesis of enzymes for secondary carbon sources when a preferred source is availableb.Increases the production of secondary metabolitesc.Promotes the use of less preferred carbon sourcesd.Activates the regulatory genes for enzyme production

3. The lac operon is an example of a(n)a) constitutive geneC) repressed geneb) induced gened) two of the above

Which of the following conditions would allow for the active transcription of the lac operon?ANSWERThe lac operon is transcribed constitutively.Lactose present, glucose absentLactose present, glucose presentLactose absent, glucose present

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 .