| (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. |
A) (i) and (ii)
B) (ii) and (iii)
C) (iii) and (iv)
D) (ii), (iii) and (iv)
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).
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