Multiple ChoiceRegulatory segments of DNA that function to increase transcription levels in eukaryotes are called:1091views6rank
Multiple ChoiceWhich of the following statements correctly describes the primary difference between enhancers and proximal control elements?3180views8rank1comments
Multiple ChoiceWhich of the following is NOT true regarding the differences of transcription in eukaryotes and prokaryotes?1731views5rank
Multiple ChoiceWhich of the following statements about transcription factors is incorrect:2547views6rank
Multiple ChoiceIn a eukaryote, transcription factors called activators may stimulate gene expression by binding to DNA sites called __________. 660views
Multiple ChoiceDioxin, produced as a by-product of various industrial chemical processes, is suspected of causing cancer and birth defects in animals and humans. It apparently acts by entering cells and binding to specific proteins, which then enter the nucleus and alter the pattern of gene expression. Therefore, dioxin acts by mimicking the action of __________. 894views
Multiple ChoiceA high rate of gene transcription in eukaryotic cells is usually dependent on __________. 646views
Textbook QuestionWhich of these statements about enhancers is correct? a. They contain a unique base sequence called a TATA box. b. They are located only in 5′ untranslated regions. c. They are located only in introns. d. They are found both upstream and downstream from the transcription start site and are functional in any orientation.692views
Textbook QuestionIn eukaryotes, what allows only certain genes to be expressed in different types of cells?445views
Textbook QuestionCompare and contrast the items in each pair: (c) general transcription factors and sigma.430views
Textbook QuestionCompare and contrast the items in each pair: (a) enhancers and the E. coli CAP binding site423views
Textbook QuestionCompare and contrast the items in each pair: (b) promoter-proximal elements and the operator of the lac operon517views
Textbook QuestionThe Hawaiian bobtail squid (Euprymna scolopes) is able to glow from luminescent Vibrio fischeri bacteria held in its light organs. As it swims at night near the ocean surface, it adjusts the amount of light visible to predators below to match the light from the stars and moon. Predators have difficulty seeing the illuminated squid against the night sky. The bacteria glow in response to a molecule that regulates expression of genes involved in light-producing chemical reactions. The regulator controls production of the genes' mRNA. Therefore, the light-producing genes are under a. transcriptional control. b. translational control. c. post-translational control. d. negative control.618views
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