Class 12 NEET Biology Molecular Basis of Inheritance Questions Part 1

Lac operon in E. coli is induced by β-galactosidase an enzyme meant for hydrolysis of lactose in glucose and galactose.
Lactose‌

β−galactosidase

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‌Glucose+Galactose
These enzymes are called as inducible enzymes, because the synthesis of such enzymes are induced by adding substrate such as lactose by 10,000 times.