Final answer:
In eukaryotic RNA processing, the non-translated sequences removed are called introns, and their precise removal is crucial for the formation of functional proteins. Option b.
Step-by-step explanation:
During eukaryotic RNA processing, the non-translated sequences that are removed from the pre-mRNA are called introns. These introns are intervening sequences that do not encode for functional proteins and must be precisely and completely removed before the mRNA can be translated into a protein.
After the removal of introns, the remaining sequences, called exons, are spliced together to form the mature mRNA transcript that codes for a protein.
Option b.