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.
A. The shape change could prevent the scrapie protein from converting normal proteins to scrapie proteins.
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For the lactose operon, lactose is a(n):
A. inducer. B. promoter. C. activator. D. repressor. E. operator.
The most important experimental result that suggested to Watson and Crick that DNA was in the form of a helix was
a. the finding of Chargaff that DNA always had equal amounts of A and T and equal amounts of G and C. b. Griffith's results with transformation. c. the discovery that DNA is wound around histone proteins. d. X-ray data from Rosalind Franklin . e. understanding DNA replication.
The appearance of air breathing organisms was most dependent upon:a
the accumulation of methane gas in the atmosphere. b. the survival of cyanobacteria on the primitive earth. c. the accumulation of ozone in the upper atmosphere. d. the survival of organisms around undersea thermal vents. e. the absence of predators on the first land masses
Infection in the respiratory tract is limited by all except
A) alveolar macrophage. B) resident microbiota. C) ciliated mucous membranes. D) coughing to bring microbes away from the lungs. E) the epiglottis sealing the airway during swallowing.