Final answer:
Gene expression in the domain Archaea is most like the domain Eukarya in terms of post-transcriptional splicing.
Step-by-step explanation:
In the domain Archaea, gene expression is most similar to that of the domain Eukarya in terms of post-transcriptional splicing. Just like eukaryotes, archaea perform post-transcriptional splicing, where the primary transcript undergoes modifications, such as the removal of introns, before it is translated into a protein. Eukarya includes eukaryotic organisms. These are organisms with cells that contain a nucleus as well as membrane-bound organelles. The kingdoms most associated with Eukarya are the Plantae, Animalia, and Fungi kingdoms.
This is in contrast to bacteria, where post-transcriptional splicing is not common, and the primary transcript is typically directly translated into a protein.