Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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The lac operon regulates expression of genes required for the breakdown of lactose.
Use the schematic diagram of the lac operon to help you answer the following
questions about the lac operon.
Representation of the Lac operon and upstream
regions in E.coli (not drawn to scale!)
Indicates 1,000s bases
Indicates regions of DNA
lacz
lacz
lacz
gene
gene
gene
....
Lac I promoter
Lac I gene
CRP
lac Z
lac
lac Z
lacY
lacA
binding
promoter
operator
gene
gene
gene
site
When wild-type E. coli are grown in media with high lactose and high glucose, which
of the following statements are true?
RNA polymerase can bind tightly to the lac Z promoter and activate a high level
of transcription
CRP protein is bound to the CRP binding site
There is a basal level of lac Z, Y and A transcription
O RNA polymerase can bind tightly to the lac I promoter and activate a high level
of transcription
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Transcribed Image Text:The lac operon regulates expression of genes required for the breakdown of lactose. Use the schematic diagram of the lac operon to help you answer the following questions about the lac operon. Representation of the Lac operon and upstream regions in E.coli (not drawn to scale!) Indicates 1,000s bases Indicates regions of DNA lacz lacz lacz gene gene gene .... Lac I promoter Lac I gene CRP lac Z lac lac Z lacY lacA binding promoter operator gene gene gene site When wild-type E. coli are grown in media with high lactose and high glucose, which of the following statements are true? RNA polymerase can bind tightly to the lac Z promoter and activate a high level of transcription CRP protein is bound to the CRP binding site There is a basal level of lac Z, Y and A transcription O RNA polymerase can bind tightly to the lac I promoter and activate a high level of transcription
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