In the lactose operon, the repressor binds to:
a. the lacI coding region.
b. the promoter.
c. the operator.
d. the lacZ coding sequence.
e. the lacY coding sequence.
Ans: c. the operator.
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Each branch point or node of a phylogenetic tree represents:
A. an environmental pressure for evolution. B. a mutational event that leads to two species. C. common ancestor to two connected branches. D. the beginning of a new domain. E. the point when life started on earth.
Which one of the following bacterial translational proteins is not a GTP-binding protein?
A. IF-2 B. EF-Tu C. EF-G D. RF-1
A drug researcher has developed a macromolecule that can bind to scrapie and thus change the prions 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
Which molecules influence the rate of transcription?
a. RNA polymerase b. regulatory proteins c. exons d. DNA e. promoters