Read the following four statements (A-D): (A) In transcription, adenosine pairs with uracil. (B) Regulation of lac operon by repressor is referred to as positive regulation. (C) The human genome has approximately 50,000 genes. (D) Haemophilia is a sex-linked recessive disease. How many of the above statements are right? (1) Four (2) One
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Answer:
4 statements are correct.
Explanation:
A is correct because in mRNA uracil is in the place of thymine.
B is incorrect because in this case it is in negative regulation. Repressor binds to the operator region and thus inhibits transcription of lac mRNA.
C is correct because every person has a duplicate copy of genes recieved from parents which is 25,000
D is correct as haemophilia is a recessive sex linked trait.
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