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15 July, 04:13

Export of RNAs from nucleus occurs primarly by

A) passive diffusion through nuclear pore complexes.

B) cotranscriptional insertion through nuclear

envelopemembrane protein pores.

C) selective transport through nuclear pore complexes

inassociation with proteins.

D) release from the nucleus when it breaks down

atmitosis.

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Answers (1)
  1. 15 July, 05:25
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    The correct answer is C) selective transport through nuclear pore complexes

    Explanation:

    Nucleus is the place where the replication and the transcription of DNA occurs. The process of translation in eukaryotes occurs in cytoplasm therefore RNA has to come out of the nucleus.

    Nuclear pore complexes are the openings in the nuclear membrane from where these molecules come out in the cytoplasm. Small RNA like tRNA directly comes out through binding directly to export receptors but large RNA like mRNA forms ribonucleoprotein particles which involves class-specific adaptor proteins for transport. So the right answer is C.
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