a. Name the molecule ‘X’ synthesised by ‘i’ gene. How does thi

1.	a. Name the molecule ‘X’ synthesised by ‘i’ gene. How does this molecule get inactivated ? b. Which one of the structural genes codes for β-galactosidase ? c. When will the transcription of this gene stop ?
Answer» a. The molecule ‘X’ is repressor. It gets inactivated when lactose (inducer) binds with the repressor molecule. b. z gene codes for β-galactosidase. c. Transcription of the gene stops when lactose is absent and thus repressor is free to bind with the operator.

a. Name the molecule ‘X’ synthesised by ‘i’ gene. How does this molecule get inactivated ? b. Which one of the structural genes codes for β-galactosidase ? c. When will the transcription of this gene stop ?

Answer»

a. The molecule ‘X’ is repressor. It gets inactivated when lactose (inducer) binds with the repressor molecule.

b. z gene codes for β-galactosidase.

c. Transcription of the gene stops when lactose is absent and thus repressor is free to bind with the operator.