In E.coli cell with the genotype lac $O ^ { c }$ $Z ^ { + }$ $Y ^ { - }$ $A ^ { - }$ would make which of the following protein products and in what manner?
A)LacZ,induced
B)LacZ and Lac A,induced
C)LacY,constitutive
D)LacZ,constitutive
E)LacZ and LacA,constitutive

Question

Quizplus · Accepted Answer

The genotype lac $O^c$ indicates a mutation in the operator that makes it non-responsive to the repressor, leading to constitutive expression of downstream genes. Since $Z^+$ is present, the LacZ (β-galactosidase) enzyme will be produced constitutively. LacY and LacA are not produced due to their respective $Y^-$ and $A^-$ mutations, which indicate non-functional or absent products.

In EColi Cell with the Genotype Lac OcO ^ { c }Oc

In EColi Cell with the Genotype Lac $O ^ { c }$