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NEET UG BIOLOGY MCQ: MOLECULAR BASIS OF INHERITANCE
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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.
(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.
View answer and explanation
Correct option: D
(ii), (iii) and (iv)
Option D ((ii), (iii) and (iv)) is correct because the regulatory gene (R) is transcribed constitutively (always), and lactose does not inhibit its translation.
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show high adaptability to the changing
environment.
Reason: Member of kingdom Monera are
efficient in regulating gene expression. Which of the following is not true for DNA polymerase? Dystrophin gene consists of Read the following four statements (i-iv).
i. In transcription, adenosine pairs with uracil.
ii. Regulation of lac operon by repressor is referred to as positive regulation
iii. The human genome has approximately 30,000 genes
iv. Haemophilia is a sex-linked recessive disease
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