Question
Biology Question on Regulation of Gene Expression
When Escherichia coli cells are cultured in a medium where Lactose is absent, the 'i' gene of Lac Operon continues to produce repressor mRNA, because it is
A
a non-coding gene
B
an operator gene
C
a constitutive gene
D
a structural gene
Answer
a constitutive gene
Explanation
Solution
The correct answer is (C) :a constitutive gene