In the galactose operon of E. coli, a repressor, encoded by the galR gene, binds to an operator site,galo, to regulate the expression of three structuralgenes, galE, galT, and galK. Expression is inducedby the presence of galactose in the media. For eachof the strains listed, would the cell show constitutive, inducible, or no expression of each of the structural genes? (Assume that galR− is a loss-of-functionmutation.)a. galR−galo+galE+galT+galK+b. galR+galocgalE+galT+galK+ c. galR−galo+galE+galT+galK−/galR+galo+galE−galT+galK+d. galR−galocgalE+galT+galK−/galR+galo+galE−galT+galK+

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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In the galactose operon of E. coli, a repressor, encoded by the galR gene, binds to an operator site,
galo, to regulate the expression of three structural
genes, galE, galT, and galK. Expression is induced
by the presence of galactose in the media. For each
of the strains listed, would the cell show constitutive, inducible, or no expression of each of the structural genes? (Assume that galR− is a loss-of-function
mutation.)
a. galR−galo+galE+galT+galK+
b. galR+galoc
galE+galT+galK+ c. galR−galo+galE+galT+galK−/
galR+galo+galE−galT+galK+
d. galR−galoc
galE+galT+galK−/
galR+galo+galE−galT+galK+

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