question_answer

Study the figure given below and answer the following questions.

(i)  Name the molecule 'X' synthesised by 'i' gene. How does this molecule get inactivated?

(ii)  Which one of the structural genes codes for \[\beta \]-galactosidase?

(iii) When will the transcription of this gene stop?

Answer:

(i)  Molecule 'X' is a represser protein. When an inducer combines with it, it is inactivated.

(ii) 'z' gene.

(iii) Transcription of Gene Stops

(a) In the case when substrate (lactose) is not available.

(b) Energy source, (glucose) is available to the cells.