Final answer:
C) prokaryotes. Microorganisms without a nucleus are known as prokaryotes, which include Bacteria and Archaea. Eukaryotic cells, unlike prokaryotes,
Step-by-step explanation:
Microorganisms characterized by the absence of a nucleus are called C) prokaryotes. Prokaryotes, which encompass the domains Bacteria and Archaea, are predominantly single-celled organisms that lack a membrane-enclosed nucleus and other organelles, such as mitochondria and chloroplasts. In contrast, eukaryotic cells, which include fungi, protists, animals, and plants, possess a membrane-enclosed nucleus, making them fundamentally different from prokaryotes in terms of cellular organization. Notably, viruses are not considered prokaryotes; they are unique entities that require a host cell to replicate and are categorized separately in microbiology due to their distinct characteristics.
Microorganisms characterized by the absence of a nucleus are called prokaryotes. Prokaryotes include organisms such as bacteria and archaea.have a nucleus and other organelles. Viruses, although not cells, are separate entities requiring a host for replication.