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8. In transcription, A) mRNA is synthesized from DNA B) the starting point of synthesis is...

8. In transcription, A) mRNA is synthesized from DNA B) the starting point of synthesis is the promoter site C) RNA polymerase binds to the promoter during initiation D) the ending point of synthesis is the terminator site E) All of the above

The tryptophan (trp) operon is actively transcribed (i.e. gene expression occurs) A) when there is excess tryptophan in the cell. B) when there is a lack of tryptophan in the cell. C) constitutively because the trp operon is always turned on. D) and is not under the control any form of gene regulation.

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Answer #1

8. E. all of the above

All of the given options are steps in the process of transcription

9. B. when there is a lack of tryptophan in the cell

The trp operon is controlled by negative feedback mechanism dependent on the concentration of tryptophan in the cell. Too less, and the operon functions normally, too much, and the operator is repressed and the operon doesn't function.

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