Final answer:
All mRNAs go through two key RNA processing steps: addition of stabilizing and signaling factors at the ends, and removal of introns through splicing.
Step-by-step explanation:
All mRNAs go through two key RNA processing steps. The first step is the addition of stabilizing and signaling factors at the 5' and 3' ends of the pre-mRNA molecule. This includes adding a 5' cap and a poly-A tail at the 3' end. The second step is the removal of intervening sequences called introns, through a process called splicing. Exons, which specify the amino acids, are spliced together with single-nucleotide accuracy.