The lactose present in the growth medium of bacteria is transported to the cell by the action of

Which one of the following sets contains enzymes coded by the structural genes of the $lac$ operon of $E. coli$?

$A$ model that relates repetitive $DNA$ sequences and their transcripts of regulation in eukaryotes was proposed by

What are promoter,operator,and structural genes?

Statement-$I$: Lac operator is present only in lac operon and it interacts specifically with lac-repressor only.
Statement-$II$: Each operon has its specific operator and specific repressor.

$A$ gene that is responsible for the synthesis of a polypeptide chain is called a .......