Transcription factors are important molecules that regulate gene activity in eukaryotes. What are the two general classes of transcription factors that exist in eukaryotes? Describe where they bind and what their effects are
What will be an ideal response?
General transcription factors assemble at promoter regions adjacent to the site of transcription. They are typically important in basal levels of transcription. The other class includes activators and repressors that bind at more distant regions called enhancer and repressor sequences, respectively. Activators and repressors are responsible for increased regulation and are often important in tissue specific and developmental regulation.
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A drug researcher has developed a macromolecule that can bind to scrapie and thus change the prion's conformation. What effect might this have on the actions of scrapie?
A. The shape change could prevent the scrapie protein from converting normal proteins to scrapie proteins. B. The shape change could induce scrapie protease activity. C. The shape change could stop the transcription of scrapie RNA. D. The shape change could stop the replication of scrapie DNA. E. The shape change could block the translation of scrapie RNA.
How does the structure of the cardiac chambers reflect their different functions?
What will be an ideal response?
Varicella-zoster virus (human herpesvirus-3)
A. uses the respiratory epithelium as its portal of entry B. becomes latent in dorsal root ganglia that serve specific dermatomes C. has humans as its reservoir D. causes chickenpox and shingles E. All of the choices are correct
Based on the Luria–Delbrück experiment, mutations that provide plants with the ability to survive on toxic soils should occur:
a. only in populations living on toxic soils. b. in all plant populations. c. randomly. d. A and B. e. B and C.