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Q 1/10
Score 0
In an E. coli cell, a mutation occurs in the operator sequence of the lac operon that prevents the lac repressor protein from binding. Which of the following describes the most likely result for the cell in an environment with low glucose and no lactose?
30
The lac genes will never be transcribed because lactose is required to induce the system.
The lac genes will be transcribed at low levels because cAMP-CAP cannot bind to the promoter without lactose.
The lac genes will be transcribed continuously at high levels because the repressor cannot block RNA polymerase.
The lac genes will not be transcribed because the absence of glucose inhibits the binding of RNA polymerase.
Q 2/10
Score 0
30
10 questions
Q.
In an E. coli cell, a mutation occurs in the operator sequence of the lac operon that prevents the lac repressor protein from binding. Which of the following describes the most likely result for the cell in an environment with low glucose and no lactose?
1
30 sec
Q.
2
30 sec
Q.
3
30 sec
Q.
In a laboratory experiment, E. coli is grown in a medium containing both glucose and lactose. Which statement correctly describes the regulatory state of the lac operon under these specific conditions?
4
30 sec
Q.
5
30 sec
Q.
An E. coli mutant is discovered that expresses a cAMP-independent CAP protein, which can bind to its DNA site even in the absence of cAMP. If this mutant is grown in a medium containing both high glucose and high lactose, what would be the predicted level of lac operon transcription compared to a wild-type cell?
6
30 sec
Q.
An E. coli strain is found to have a loss-of-function mutation in the gene encoding the enzyme adenylyl cyclase, which converts ATP to cAMP. Which of the following describes the most likely effect on the lac operon when this strain is grown in a medium containing lactose as the only available sugar?
7
30 sec
Q.
8
30 sec
Q.
An experimental strain of E. coli is treated with a chemical that binds to the lac repressor and prevents it from ever releasing the operator, even in the presence of allolactose. If this strain is placed in a medium with no glucose and high concentrations of lactose, what will be the result?
