The poly(a) tails are added to the 3' end of the pre-mRNA for its transport and stabilization from the nucleus to the cytoplasm. So, option B is the correct answer.
The poly(a) tail is added to the messenger RNA molecule during RNA processing to increase the stability of the molecule. It is a long chain of adenine nucleotides.
The 3' end of the transcript is cleaved to free a 3' hydroxyl and then an enzyme called poly-A polymerase adds adenine nucleotides to the RNA. This poly(a) tail prevents degradation and thus, makes the RNA more stable. It then sends the said molecule from the nucleus to get translated into a protein by ribosomes in the cytoplasm. So, option B is the answer.
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