1. Tardigrade
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  4. Lactose is the substrate for the enzyme beta galactosidase and it regulates switching on and off of the operon. Hence it is termed as

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Q. Lactose is the substrate for the enzyme beta galactosidase and it regulates switching on and off of the operon. Hence it is termed as

NTA AbhyasNTA Abhyas 2020Molecular Basis of Inheritance

Solution:

In lac operon, the regulator gene produces active repressor protein which binds to the operator switching it off. When bacteria are grown in a medium having lactose, it functions as an inducer and binds repressor making it inactive and switching on the system.