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couple007 couple007
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10 years ago
Which of the following single point mutations would abolish the capacity of E. coli to grow on several sugars other than glucose?
A.  an operator mutation
B.  a repressor mutation
C.  a mutation in the cyclic AMP binding protein
D.  a mutation in glutamine synthetase
E.  C and D


Regulation of the trp operon at the level of transcription initiation is an example of:
A.  a positive inducible system
B.  a positive repressible system
C.  a negative inducible system
D.  a negative repressible system
E.  a constitutive system
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