RNAP can access the lacz promoter irrespective of whether CAP-CAMP is binding the CAP OTrueO False IlvY is a LysR regulator, and it helps control transcription of a neighboring gene, ilvC. IlvY can eitherbend the DNA and block RNAP's access to ilvC's -35 promoter site, or it can allow access to the ilvC -35site, thereby promoting ilvC transcription. What determines whether IlvY is repressing or activatingtranscription from the ilvC promoter?The presence of the co-inducer acetolactate - acetolactate binds to llvY and changes IlvY's shape such that itdoesn't block the -35 of the ilvC promoter.IlvY represses ilvC transcription when the llvC protein is bound to llvY, and it activates ilvC transcription whenthe llvC protein is not present to bind to llvY.The presence of the co-inducer valine - when valine is present, it binds llvY and causes llvY to represstranscription from the ilvC promoter.The presence of the co-inducer acetolactate - acetolactate induces negative supercoiling at the ilvC promoter,which represses ilvC transcription.

Lac operon is a set of structural genes regulated by a common promoter. It is found in bacteria.

Answered: RNAP can access the lacZ promoter…

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RNAP can access the lacZ promoter irrespective of whether CAP-CAMP is binding the CAP o True False

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Question

RNAP can access the lacz promoter irrespective of whether CAP-CAMP is binding the CAP O
True
O False

IlvY is a LysR regulator, and it helps control transcription of a neighboring gene, ilvC. IlvY can either
bend the DNA and block RNAP's access to ilvC's -35 promoter site, or it can allow access to the ilvC -35
site, thereby promoting ilvC transcription. What determines whether IlvY is repressing or activating
transcription from the ilvC promoter?
The presence of the co-inducer acetolactate - acetolactate binds to llvY and changes IlvY's shape such that it
doesn't block the -35 of the ilvC promoter.
IlvY represses ilvC transcription when the llvC protein is bound to llvY, and it activates ilvC transcription when
the llvC protein is not present to bind to llvY.
The presence of the co-inducer valine - when valine is present, it binds llvY and causes llvY to repress
transcription from the ilvC promoter.
The presence of the co-inducer acetolactate - acetolactate induces negative supercoiling at the ilvC promoter,
which represses ilvC transcription.

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