Final answer:
The Ac (DNA type) element in eukaryotic genes has both exons and introns, with introns being longer than exons.
Step-by-step explanation:
The Ac (DNA type) element has exons and introns.
Eukaryotic genes are composed of exons, which correspond to protein-coding sequences, and intervening sequences called introns, which are removed from the pre-mRNA during processing. Introns do not encode functional proteins. In general, introns are much longer (60-80%) than exons (20-40%).