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Which Is True About an Operator Constitutive (Oc)mutation

Question 21

Multiple Choice

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.

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