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gtnhenbr [62]
3 years ago
12

Which end of a new mRNA transcript gets a cap during processing in the nucleus?

Biology
1 answer:
rosijanka [135]3 years ago
4 0

Answer:

d. the 5' end

Explanation:

Capping is a co-transcriptional modification made to RNA in the nucleus after the first 25–30 nts are incorporated into the nascent transcript, which is synthetized in the 5' ---> 3' direction.

The cap consists of a methylated guanosine nucleotide added to the 5' end of the new mRNA transcript, and is important for several processes, which include:

  1. Protection of the mRNA from the attack of phosphatases and nucleases.
  2. Splicing of mRNA in the nucleus.
  3. Nuclear export of the mRNA to the cytoplasm.
  4. Cap-dependent protein synthesis.
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