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 b-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 b-galactosidase. 

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



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