Final answer:
The statement that the largest eukaryotic genes have many and large introns is true. Eukaryotic genes contain both exons and introns, the latter being spliced out during mRNA processing. Large numbers of introns and their considerable lengths compared to exons are a distinct feature of eukaryotic genes.
Step-by-step explanation:
Intron sequences, once thought to be irrelevant, are now recognized for potential roles in gene regulation, although their exact biological significance is still not completely understood.
Some researchers argue that introns could slow down gene expression due to the extended time needed to transcribe them, while others propose that they might be remnants from evolutionary gene fusion events.