A. regulating translation of an existing mRNA B. DNA sequence rearrangements C.

Question

A. regulating translation of an existing mRNA

B. DNA sequence rearrangements

C. modification of an existing protein

D. activating transcription by relieving repression

E. use of a transcriptional activator to upregulate a gene

2. What is the role of the first structural gene (lacZ) in the lac operon? Select all that apply.
Choose one or more:

A.It transports lactose into the cell.

B.It binds to and inactivates the lac repressor.

C.It causes cAMP levels to rise in the presence of increasing concentrations of lactose.

D.It breaks down lactose into glucose and galactose.

E.It isomerizes lactose into allolactose.

3. Increased synthesis of ______________ is a direct result of decreasing glucose levels.

Explanation / Answer

1) The correct answer is option C that is modification of an existing protein represent the fastest and easiest reversible way for a cell to alter its physiology.

2) The correct answer is option D that is it breaks down lactose into glucose and galactose and option E that is it isomerizes lactose into allolactose.

3) The correct answer is option B that is cAMP. Increased synthesis of cAMP is a direct result of decreasing glucose levels.

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