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Which of these sequences will mark a site of polyadenylation?

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Which of these sequences will mark a site of polyadenylation?

(a) AAUAAA—-GGUUUGU——-CA——-

(b) UUUGUGUG—–CA—-AUUAAA

(c) AAUAAA—–CA—-UUUUGUGU

(d) CA—–AAUAAA——UUUUGUGUGU

The question was asked in a national level competition.

My doubt stems from Post-Transcriptional Modification in division Gene Expression : Transcription Prokaryotes of Cytogenetics

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Correct answer is (c) AAUAAA—–CA—-UUUUGUGU

Explanation: The cleavage sequence has a consensus of AAUAAA sequence towards the 5’ and a G/U box towards the 3’ end and a CA dinucleotide in the middle. The cleavage is just after 3’ to the CA.

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