Which part of the lac operon is cis- dominant?
A) lacI
B) lacY
C) lacA
D) lacZ
E) lacO

Name: Which part of the lac operon is cis- dominant? A) lacI B) lacY C) lacA D) lacZ E) lacO
Brand: Quizplus
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Question

Quizplus · Accepted Answer

The lacO (lac operator) is cis-dominant because it affects only the structural genes on the same DNA molecule. The operator region controls the access of RNA polymerase to the genes downstream in the operon, thus its mutations affect the expression of the lac operon genes on the same DNA molecule.

Which Part of the Lac Operon Is Cis- Dominant