Podcast
Questions and Answers
What molecule represses the production of β-galactosidase in the presence of glucose in lactose metabolism?
What molecule represses the production of β-galactosidase in the presence of glucose in lactose metabolism?
- CAP protein
- Cyclic AMP
- Glucose (correct)
- Lactose
Which protein binds near the lac promoter to trigger transcription in the lac operon?
Which protein binds near the lac promoter to trigger transcription in the lac operon?
- CAP protein (correct)
- Cyclic AMP
- β-galactosidase
- Lactose
What activates expression of the lac operon through positive control?
What activates expression of the lac operon through positive control?
- Glucose
- Lactose
- Cyclic AMP (correct)
- β-galactosidase
In the lac operon, which mutation would result in the inability to produce β-galactosidase?
In the lac operon, which mutation would result in the inability to produce β-galactosidase?
Which molecule regulates the activity of the CAP protein in the lac operon?
Which molecule regulates the activity of the CAP protein in the lac operon?
What occurs when glucose is abundant in an E. coli cell?
What occurs when glucose is abundant in an E. coli cell?
What do lacZ- mutants lack?
What do lacZ- mutants lack?
Which protein is lacking in lacY- mutants?
Which protein is lacking in lacY- mutants?
What is the characteristic of lacI- mutants?
What is the characteristic of lacI- mutants?
Which two proteins are essential for E. coli to utilize lactose?
Which two proteins are essential for E. coli to utilize lactose?
What is the regulatory function of the lacI gene product?
What is the regulatory function of the lacI gene product?
What controls the expression of lacZ and lacY genes in E. coli?
What controls the expression of lacZ and lacY genes in E. coli?
What is the function of lactose permease in E.coli?
What is the function of lactose permease in E.coli?
Which type of mutant of E.coli would not be able to metabolize lactose?
Which type of mutant of E.coli would not be able to metabolize lactose?
When both glucose and lactose are present, what happens to β-galactosidase production in E.coli?
When both glucose and lactose are present, what happens to β-galactosidase production in E.coli?
Which mutant strain of E.coli would have a defective β-galactosidase enzyme?
Which mutant strain of E.coli would have a defective β-galactosidase enzyme?
What is the role of lacI gene in E.coli gene regulation?
What is the role of lacI gene in E.coli gene regulation?
What happens to lactose metabolism in lacY- mutants of E.coli?
What happens to lactose metabolism in lacY- mutants of E.coli?
