In the absence of tryptophan, __________
A) the inactive repressor cannot bind trpO, so operon gene transcription occurs
B) the active repressor binds trpP, so operon gene transcription is repressed
C) the inducer cannot bind trpO, so operon gene transcription occurs
D) the active repressor cannot bind trpO, so operon gene transcription is attenuated
E) the repressor binds the corepressor, and operon gene transcription occurs
A
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The technique of preparing mitotic chromosomes involves a staining procedure using Giemsa stain. One variation of this technique allows a low-resolution of chromosome bands while a second variation allows a high resolution. At low resolution we can see about ________ bands while at high resolution we see about ________ bands.
A) 300; 2000 B) 300; 1000 C) 100; 2000 D) 100; 1000
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a. A. b. B. c. C. d. D. e. E.
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