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 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). b) Gene A and gene B belong to the same operon. c) 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). d) Gene A and B have the same control element sequences and the cells of tissue 1 and tissue 2 express different transcription factors. 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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Dissection

Dissection is the process of cutting up the tissue of a dead or live animal or plant, to do anatomical studies and surgical treatments. The purpose of dissection is to learn more about the overall structure of organs and organ systems and thereby understand the physiology of the organism.