Biology - Molecular Basis of Inheritance Question with Solution | TestHub
Given below are two statements regarding Lac operon.
Statement (I): In Lac operon, in the absence of lactose, repressor protein binds to the operator gene and represses the process.
Statement (II): The lactose acts as an inducer of its own break down.
In light of the above statements, choose themost appropriateanswer from the options given below.
Options:
Answer:
Solution:
In the Lac operon, the gene continuously synthesizes the repressor protein. In the absence of lactose, this repressor protein binds to the operator region, preventing RNA polymerase from transcribing the structural genes. Thus, Statement (I) is correct.
When lactose is present, it acts as an inducer by binding to the repressor protein and inactivating it. This allows the transcription of genes whose products (such as -galactosidase) are responsible for the breakdown of lactose. Therefore, lactose induces the synthesis of enzymes required for its own metabolism. Thus, Statement (II) is also correct.
Both Statement (I) and Statement (II) are correct.
Answer: Both Statement (I) and Statement (II) are correct.
