| (i) In transcription, adenosine pairs with uracil. |
| (ii) Regulation of lac operon by represser is referred to as positive regulation. |
| (iii) The human genome has approximately 50,000 genes. |
| (iv) Haemophilia is a sex-linked recessive disease. |
| How many of the above statements are correct? |
A) Two
B) Three
C) Four
D) One
Correct Answer: A
Solution :
[a] Statement (i) and (iv) are / is correct Regulation of lac operon by repressor is referred as negative regulation. In negative regulation, a repressor molecule binds to the operator of an operon and terminates transcription. In positive regulation, an activator interacts with the RNA polymerase in the promoter region to initiate transcription. Human genome contains some 20,000- 25,000 billion genes bases.
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