An E.coli cell with the genotype lac would make which of the following protein products and in what manner?
A)LacZ, induced
B)LacZ and Lac A, induced
C)LacY, constituitive
D)LacZ, constituitive
E)LacZ and LacA, constituitive

Question

An E.coli cell with the genotype lac     would make which of the following protein products and in what manner?
A)LacZ, induced 
B)LacZ and Lac A, induced 
C)LacY, constituitive 
D)LacZ, constituitive 
E)LacZ and LacA, constituitive

Quizplus · Accepted Answer

The genotype provided is for a Lac- mutant with four mutations in the lac operon. However, only the lacZ gene is mentioned in the genotype. The other mutations are not related to the lac operon. Therefore, the only protein that can be produced in this mutant is LacZ, and since the mutations are not related to the regulation of the lac operon, LacZ expression would be constitutive.

An EColi Cell with the Genotype Lac