Molecular Basis Of Inheritance Question 138
Question: Identify the statements pertaining to the regulatory genes (R), associated with the lac operon that are incorrect.
(i) mRNA is transcribed from the R gene whether lactose is present or not. (ii) mRNA is transcribed from the R gene only when the lactose is present. (iii) mRNA is transcribed from the R gene only when the lactose is not present. (iv) Lactose inhibits the translation or R gene mRNA.
Options:
A) (i) and (ii)
B) (ii) and (iii)
C) (iii) and (iv)
D) (ii), (iii) and (iv)
Show Answer
Answer:
Correct Answer: D
Solution:
[d] In lac opeon model, regulatory gene is constitutively working.
Its translation product (repressor) is inactivated by the presence of an inducer (lactose).
BETA
