Which is true about an operator constitutive (Oc) mutation?
A) An Oc mutation on the chromosome can affect the expression of structural genes on a plasmid.
B) The Oc mutation prevents the expression of a diffusible product that regulates the lac operon.
C) An F' I+P+ Oc Z-Y+A-/I+P+O+Z+Y+A+ merozygote expresses the enzymes of the lac operon constitutively.
D) The O? mutations act only in cis.
E) An F' I+P+ Oc Z+Y+A+/I+P+O+Z-Y-A- merozygote is inducible for the three enzymes of the lac operon.
Correct Answer:
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Q16: Genes encoding products that regulate the expression
Q17: Which of the following types of molecules
Q18: Genes that are continually being expressed in
Q19: Genes whose expression is turned on in
Q20: Which of the following is a mechanism
Q22: What happens when a repressor is bound
Q23: Which characteristic is exhibited by transcription-termination signals
Q24: The enzyme b-galactosidase is encoded by
A) lacA.
B)
Q25: Which statement about catabolite repression is false?
A)
Q26: Which of the following is true regarding
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