What are the two active sites or "domains" on a repressor protein?
What will be an ideal response?
DNA-binding and allosteric
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A prophage replicates
A) along with its host while the lytic genes are expressed. B) along with its host while the lytic genes are not expressed. C) independently of its host while the lytic genes are expressed. D) independently of its host while the lytic genes are not expressed.
A pregnant woman had contact with her nephew who was just diagnosed with a rubella infection. Acute and convalescent samples were taken, which resulted in an acute titer of 1:16 and a con-valescent titer of 1:32 . Which one of the following comments explains the risk to the fetus?
a. The risk is low; a fourfold rise in titer is not present. b. The risk is high; more than a fourfold rise is present in titer. c. The risk is high because both titers are elevated. d. Rubella is not a congenital disease; there-fore the test should not have been ordered.
Which of the following references clusters of connected neurons?
a. nerve lobes b. attenuations c. motor nerves d. ganglia
The trp operator is:
A. a protein that binds at the trp promoter B. the site where the trp repressor binds C. the site where the trp repressor is synthesized D. the site where RNA polymerase first binds to the trp operon