Which of the following best describes the cellular organization of archaebacteria?

• A. They are multicellular organisms.
• B. They are acellular entities.
• C. They can be both unicellular and multicellular.
• D. They are unicellular organisms.

Answer: (D)

Verified step by step guidance

1. Understand the term 'cellular organization' which refers to how cells are structured and organized in an organism, such as unicellular (single-celled) or multicellular (many cells).
2. Recall that archaebacteria, also known as Archaea, are a group of microorganisms distinct from bacteria and eukaryotes, often found in extreme environments.
3. Recognize that archaebacteria are prokaryotic organisms, meaning they lack a nucleus and membrane-bound organelles, and are typically single-celled.
4. Eliminate options that describe multicellularity or acellularity, since archaebacteria are not multicellular nor acellular entities like viruses.
5. Conclude that the best description of archaebacteria's cellular organization is that they are unicellular organisms.