*please answer all* 1.Which of the following molecules, when taken up by the cel

Question

*please answer all*

1.Which of the following molecules, when taken up by the cell, binds to the repressor so that the repressor no longer binds to the operator?

2.Suppose an experimenter becomes proficient with a technique that allows her to move DNA sequences within a prokaryotic genome. If she moves the operator to the far end of the operon, past the transacetylase (lacA) gene, which of the following would likely occur when the cell is exposed to lactose?

3.Which of the following environments would most likely lead to the transcription of the lactose operon?

4.A lack of which of the following molecules would result in the cell's inability to "turn off" genes?

5.What would occur if the repressor of an inducible operon were mutated so it could not bind the operator?

6.Which of the following mechanisms is used to coordinate the expression of multiple, related genes in eukaryotic cells?

Explanation / Answer

1. Inducer is a substance which is bound to repressor and inactivate the repressor protein and deattach from the the operator to allow interaction of RNA polymerase enzyme. Option D is correct.

2. Three genes will continually transcribed because repressor bound on operator may not affact interaction of RNA polymerase. Option E is correct.

3. When cyclic AMP and lactose are in high concentration then Lac operon will stimulated by two way speed up system. By CAP-cAMP and repressor removal. Option A is correct.

4. Corepressor is a molecule in prokaryotes binding of which to repressor actuvate it and stops the gene expression. Option E is correct.

5. Operon genes will continually transcribed due to absence of regulation. Option A is correct.

6. Combination of control elements coordinates tge simultaneous activation and all the genes will transcribe coordinated manner. Option B is correct.

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