Before Messenger RNA is Exported from the Nucleus,_______________

Question

Before messenger RNA is exported from the nucleus,_______________.  
A) all exons are deleted and removed
B) a poly-A tail and modified guanine "cap" are added
C) anticodons are assembled
D) the transfer RNA transfers the messenger RNA to the ribosome
E) the single RNA strand duplicates itself in much the same way as DNA

Accepted Answer

Before messenger RNA is exported from the nucleus, a poly-A tail and a modified guanine "cap" are added to protect it from degradation and facilitate its binding to ribosomes. This process is known as RNA processing or post-transcriptional modification. Exons (coding regions) are not deleted and removed before export, as they are essential for protein synthesis. Anticodons are not assembled during mRNA processing, as they are only found on transfer RNA molecules. The transfer RNA does not transfer the mRNA to the ribosome during mRNA processing. The single RNA strand does not duplicate itself during mRNA processing, as RNA replication is a different process.