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Question

Which of the following nucleotide sequence contain 4 pyrimidine bases?


A
GCUAGACAA
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B
GATCAATGC
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C
UAGCGGUAA
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D
BOTH a and c
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Solution

The correct option is A GCUAGACAA
Purines are double ring while pyrimidines are single ring structure. Adenine and guanine are purines while thymine and cytosine are pyrimidines. A purine is attached to pyrimidine by hydrogen bond. Adenine is attached to thymine by two hydrogen bonds while three hydrogen bond is present between guanine and cytosine. In RNA, thymine is replaced uracil. In option A, four pyrimidine bases are present (thymine- 2, cytosine - 2).
So, the correct answer is option A.

Biology

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