Final answer:
Pre-mRNAs require capping, polyadenylation, and splicing in the nucleus before they can be translated into proteins. The correct answer is a. Nucleus, translated.
Step-by-step explanation:
Pre-mRNAs must be capped, polyadenylated, and spliced in the nucleus before they can be translated. The correct answer is: a. Nucleus, translated.
During the process of mRNA processing, several modifications occur within a eukaryotic cell's nucleus. The pre-mRNA receives a 5' cap and a 3' poly-A tail, which are crucial for the stability and export of the mRNA from the nucleus to the cytoplasm. In addition to capping and tailing, pre-mRNAs undergo splicing, where non-coding regions known as introns are removed and the coding regions, exons, are joined together. Only after these modifications can the mRNA be transported out of the nucleus and become associated with ribosomes in the cytoplasm for translation into protein.