stream of their coding sequence. The interaction of these enhancers with specific pression. Gene A Gene B Tissue 1 OFF ON Tissue 2 ON OFF ese two genes are expressed differentially in two different tissues (tissue 1 and til

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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.
Gene A
Gene B
Tissue 1
OFF
ON
Tissue 2
ON
OFF
These two genes are expressed differentially in two different tissues (tissue 1 and tissue 2) according to the table below.
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 gene B belong to the same operon.
d) 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).
e) Gene A and B have different control element sequences and the cells of tissue 1 and tissue 2 express different transcription
factors.
Transcribed Image Text: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. Gene A Gene B Tissue 1 OFF ON Tissue 2 ON OFF These two genes are expressed differentially in two different tissues (tissue 1 and tissue 2) according to the table below. 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 gene B belong to the same operon. d) 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). e) Gene A and B have different control element sequences and the cells of tissue 1 and tissue 2 express different transcription factors.
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