In normal splicing, what structure does the ribosome bind to as it emerges from the nuclear pore?

The ribosome binds to messenger RNA (mRNA) as it emerges from the nuclear pore during the process of translation. After transcription, mRNA is processed and then exported from the nucleus to the cytoplasm, where it serves as the template for protein synthesis. The ribosome recognizes specific sequences within the mRNA, including the 5' cap and the start codon, which allow it to attach and initiate translation effectively.

The mRNA contains coding information derived from the DNA and undergoes splicing where introns are removed and exons are joined, but it is the mRNA itself that the ribosome directly interacts with once it is in the cytoplasm. This binding is crucial as it sets the stage for the translation process, involving the reading of codons and the assembly of a polypeptide chain. The other options, while related to the overall process of gene expression, do not represent the immediate structure that the ribosome binds to upon leaving the nucleus.