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Which of the following form 5’cap?

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Which of the following form 5’cap?

(a) 5’   ——>    5’ PPP linkage

(b) 5’   ——>    3’ PPP linkage

(c) 3’   ——>    3’ PPP linkage

(d) 3’   ——>    5’ NPP linkage

I have been asked this question in examination.

The query is from RNA Processing in section Molecular Genetics of Life Sciences

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Right choice is (a) 5’   ——>    5’ PPP linkage

The best explanation: A GTP is added to the 5’ end of the RNA with an unusual 5’   ——>    5’ PPP linkage. The guanine would be methylated further and forms 5’ cap.

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