Question

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​

Answer 1

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.