Q7. Arrange the given steps in correct sequence of their
occurrence when lactose is provided in the

Q: What is the correct answer for CUET UG Biology Q7?

The correct answer is b. This question describes the regulation of the lac operon in bacteria when lactose is present as an inducer: 1. **(C) Lactose binds to repressor protein:** When lactose is available, it (or its derivative allolactose) acts as an inducer. It binds to the active repressor protein, causing a conformational change that inactivates the repressor. 2. **(A) Operator got free, RNA polymerase binds to pro

Q: Q7. Arrange the given steps in correct sequence of their occurrence when lactose is provided in the growth medium of bacteria: (A) Operator got free, RNA polymerase binds to promoter (B) Lactose is…

The correct answer is b. This question describes the regulation of the lac operon in bacteria when lactose is present as an inducer: 1. **(C) Lactose binds to repressor protein:** When lactose is available, it (or its derivative allolactose) acts as an inducer. It binds to the active repressor protein, causing a conformational change that inactivates the repressor. 2. **(A) Operator got free, RNA polymerase binds to pro

Q: What are the options for this CUET UG Biology question?

A. (D), (B), (C), (A) · B. (C), (A), (D), (B) · C. (C), (B), (D), (A) · D. (A), (B), (C), (D)

Question

Q7. Arrange the given steps in correct sequence of their
occurrence when lactose is provided in the growth
medium of bacteria:
(A) Operator got free, RNA polymerase binds to
promoter
(B) Lactose is hydrolysed to glucose and galactose
(C) Lactose binds to repressor protein
(D) Gene z, y, a are transcribed
Choose the correct answer from the options given
below:
(a) (D), (B), (C), (A)
(b) (C), (A), (D), (B)
(c) (C), (B), (D), (A)
(d) (A), (B), (C), (D)

FirstInTest · Accepted Answer

This question describes the regulation of the lac operon in bacteria when lactose is present as an inducer:
1.  **(C) Lactose binds to repressor protein:** When lactose is available, it (or its derivative allolactose) acts as an inducer. It binds to the active repressor protein, causing a conformational change that inactivates the repressor.
2.  **(A) Operator got free, RNA polymerase binds to promoter:** The inactivated repressor can no longer bind to the operator region. This frees the operator, allowing RNA polymerase to bind to the promoter region.
3.  **(D) Gene z, y, a are transcribed:** With RNA polymerase bound and the operator cleared, the structural genes *z*, *y*, and *a* are transcribed into messenger RNA (mRNA).
4.  **(B) Lactose is hydrolysed to glucose and galactose:** The mRNA is translated into enzymes like beta-galactosidase (from gene *z*), which hydrolyzes lactose into glucose and galactose.
Therefore, the correct sequence of events is (C), (A), (D), (B).

Answer

(D), (B), (C), (A)

Answer

(C), (A), (D), (B)

Answer

(C), (B), (D), (A)

Answer

(A), (B), (C), (D)

Related Questionsin Biology

More from CUET UG

Browse CUET Questions by Subject

Practice More CUET UG Questions