In a bacteria that possesses the lac operon, which of the following occurs when glucose is low and lactose is abundant? a. Lactose transport to the cell is improved. b. Lactose metabolism is increased by the binding of lactose to the operon. c. Lactose permease converts lactose to glucose and galactose. d. Beta-galactosidase activates the operon.
Added by Bruce M.
Step 1
Step 1: In a bacteria that possesses the lac operon, when glucose is low and lactose is abundant, the lack operon genes are activated to enhance lactose metabolism. Show more…
Show all steps
Your feedback will help us improve your experience
Shaiju T and 81 other Biology educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Which of the following statements describes prokaryotic transcription of the lac operon? a. When lactose and glucose are present in the medium, transcription of the lac operon is induced. b. When lactose is present but glucose is absent, the lac operon is repressed. c. Lactose acts as an inducer of the lac operon when glucose is absent. d. Lactose acts as an inducer of the lac operon when glucose is present.
For the $E$. coli lac operon, when lactose is present: a. and glucose is absent, cAMP binds and activates catabolic activator protein (CAP). b. and glucose is absent, the level of cAMP decreases. c. activated CAP binds the repressor protein to remove it from the operator gene. d. the cell prefers lactose over glucose. e. RNA polymerase cannot bind to the promoter.
Maitreya E.
The lac operon consists of regulatory regions such as the promoter as well as the structural genes lacZ, lacY, and lacA, which code for proteins involved in lactose metabolism. What would be the outcome of a mutation in one of the structural genes of the lac operon? a. Mutation in structural genes will stop transcription. b. Mutated lacY will produce an abnormal $\beta$ galactosidase protein. c. Mutated lacA will produce a protein that will transfer an acetyl group to $\beta$ galactosidase. d. Transcription will continue but lactose will not be metabolized properly.
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD