Question

If a bacterium does not have a nucleus or organelles, is it larger or smaller than the other single celled organisms?

Answer 1

All prokaryotes are single-celled organisms, but so are many eukaryotes. In fact, the vast majority of organisms on earth are single-celled, or “unicellular.” The prokaryotes are split into two taxonomic domains: the Bacteria and Archaea. All eukaryotes fall under the domain Eukarya. Within the Eukarya, the only groups that are dominated by multiple-celled organisms are land plants, animals and fungi. The rest of the Eukarya are partof a large, diverse group of organisms called the protists, most of which are unicellular organisms.

Answer 2

Bacteria are single celled organisms. There is no double membrane structure present in bacteria.  

Presence of absence of any organelle in it won’t make it bigger or smaller than other single celled organisms because of any structure won’t double the number of cells. The number of cell will always be remain one.