Question
Biology Question on Regulation of Gene Expression
The inducer for switching ??n??the lac operon in bacteria is:
A
presence of lactose
B
number of bacteria
C
presence of structural genes in the bacteria
D
presence of sucrose
Answer
presence of lactose
Explanation
Solution
Lactose is the substrate for the enzyme beta galactosidase and it regulates switching on and off of the operon. It is termed as inducer.