Study the figure given below and answer the question:
(a) How does the repressor molecule get inactivated?
(b) When does the transcription of lac mRNA stop?
(c) Name the enzyme transcribed by the gene 'Z'.
(a) Inducer binds with the repressor, unable to bind with the operator.
(b) In absence of lactose transcription of lac mRNA stops, repressor of the operon is synthesized from the 'i' gene. The repressor protein binds to the operator region of the operon and stops transcription.
(c) The gene 'Z' codes for -galactosidase (-gal).