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Question

mRNAs are capped by

A
Modified GTP at the 3’ end and modified ATP at the 5’ end
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B
Modified Poly G tail at the 3’ end and ATP at the 5’ end
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C
Modified GTP at the 5’ end and Poly A tail at the 3’ end
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D
Modified GTP at the 3’ end and Poly A tail at the 5’ end
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Solution

The correct option is C Modified GTP at the 5’ end and Poly A tail at the 3’ end
The newly transcribed mRNA strand undergoes processing before it proceeds into the cytoplasm. This processing involves capping, which is the addition of a modified form of guanosine triphosphate (GTP) at the 5’ end, and tailing, which involves the addition of about 200-250 adenines at the 3’ end to form the poly A tail.

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