BIOLOGY 12E CONNECT ACCESS CARD
BIOLOGY 12E CONNECT ACCESS CARD
12th Edition
ISBN: 9781264938513
Author: Raven
Publisher: MCG
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Chapter 16, Problem 2S

Examples of positive and negative control of transcription can be found in the regulation of expression of the bacterial operons lac and trp. Use these two operon systems to describe the difference between positive and negative regulation.

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Describe how the components of the trp operon system are affected by a mutation in trpC?  Why is it that once enviornmental tryptophan is inserted into the cell, only the trp repressor is activated (turned on)?
Under low tryptophanyl-tRNA (tRNAtrp), we expect the trp operon to be expressed because:   Question 13 options:   Sections 1 and 2 of the leader form a hairpin that acts as a transcriptional terminator.   Sections 2 and 3 of the leader form a hairpin that prevents the formation of a transcriptional terminator.   Sections 1 and 2 of the leader form a hairpin that prevents the formation of a transcriptional terminator.   Sections 2 and 3 of the leader form a hairpin that acts as a transcriptional terminator.   Sections 3 and 4 of the leader form a hairpin that acts as a transcriptional terminator.
For the following types of transcriptional control, indicate whether the protein produced by the regulator gene will be synthesized initially as an active repressor or as an inactive repressor. Q. Negative control in a repressible operon

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Bacterial Genomics and Metagenomics; Author: Quadram Institute;https://www.youtube.com/watch?v=_6IdVTAFXoU;License: Standard youtube license