18. Two eukaryotic genes (A and B) are involved in two different metabolic pathways, and each has a control element sequence (enhancer) upstream of their coding sequence. The interaction of these enhancers with specific transcription factors determines the level of gene expression. These two genes are expressed differentially in two different tissues (tissue 1 and tissue 2) according to the table below. Tissue 1 Tissue 2 Gene A OFF ON Gene B ON OFF What can explain this pattern of gene expression? A. Gene A and B have different control element sequences and the cells of tissue 1 and tissue 2 express the same transcription factors (at the same concentration and at the same time). B. Gene A and B have the same control element sequences and the cells of tissue 1 and tissue 2 express different transcription factors. C. Gene A and B have the same control element sequences and the cells of tissue 1 and tissue 2 express the same transcription factors (at the same concentration and at the same time). D. Gene A and B have different control element sequences and the cells of tissue 1 and tissue 2 express different transcription factors. E. Gene A and gene B belong to the same operon.
18. Two eukaryotic genes (A and B) are involved in two different metabolic pathways, and each has a control element sequence (enhancer) upstream of their coding sequence. The interaction of these enhancers with specific transcription factors determines the level of gene expression. These two genes are expressed differentially in two different tissues (tissue 1 and tissue 2) according to the table below. Tissue 1 Tissue 2 Gene A OFF ON Gene B ON OFF What can explain this pattern of gene expression? A. Gene A and B have different control element sequences and the cells of tissue 1 and tissue 2 express the same transcription factors (at the same concentration and at the same time). B. Gene A and B have the same control element sequences and the cells of tissue 1 and tissue 2 express different transcription factors. C. Gene A and B have the same control element sequences and the cells of tissue 1 and tissue 2 express the same transcription factors (at the same concentration and at the same time). D. Gene A and B have different control element sequences and the cells of tissue 1 and tissue 2 express different transcription factors. E. Gene A and gene B belong to the same operon.
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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Transcribed Image Text:18. Two eukaryotic genes (A and B) are involved in two different metabolic pathways, and each has a
control element sequence (enhancer) upstream of their coding sequence. The interaction of these
enhancers with specific transcription factors determines the level of gene expression.
These two genes are expressed differentially in two different tissues (tissue 1 and tissue 2) according
to the table below.
Tissue 1
Tissue 2
Gene A
OFF
ON
Gene B
ON
OFF
What can explain this pattern of gene expression?
A. Gene A and B have different control element sequences and the cells of tissue 1 and tissue 2
express the same transcription factors (at the same concentration and at the same time).
B. Gene A and B have the same control element sequences and the cells of tissue 1 and tissue 2
express different transcription factors.
C. Gene A and B have the same control element sequences and the cells of tissue 1 and tissue 2
express the same transcription factors (at the same concentration and at the same time).
D. Gene A and B have different control element sequences and the cells of tissue 1 and tissue 2
express different transcription factors.
E. Gene A and gene B belong to the same operon.
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