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An RNA molecule folds back upon itself to form a "hairpin" structure held together by a region of base pairing. One segment of the paired region has the sequence 5'-GCAUUGA-3'. What is the sequence with which this segment is paired

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Answer:

5'-UCAAUGC-3'

Explanation:

According to base pairing rule of DNA and RNA, A is always pairs with T ( in case of DNA) or with U ( in case of RNA) with two hydrogen bonds(A=T), and C is always pairs with G in both DNA and RNA  with three hydrogen bonds ( C≡G).

As given here, one segment of RNA molecule containing sequence 5'-GCAUUGA-3', so as the rule, G always binds with C and so on, so the sequence of the binding segment would be 3'-CGUAACU-5'. it can be written as 5'-UCAAUGC-3'

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