You isolate a cell with the following characteristics:(1) no nucleus, (2) a cell wall, and the cell is (3) 2 μm in size. This cell could be a/an:

• A. Bacterium.
• B. Plant cell.
• C. Animal cell.
• D. Bacterial cell or a plant cell.
• E. Plant cell or an animal cell.

Answer: (A)

Verified step by step guidance

1. Identify the characteristics of the cell: no nucleus, a cell wall, and a size of 2 μm.
2. Recall that cells without a nucleus are classified as prokaryotic cells. Prokaryotic cells include bacteria and archaea.
3. Consider the presence of a cell wall. Both bacteria and plant cells have cell walls, but animal cells do not.
4. Evaluate the size of the cell. A size of 2 μm is typical for bacterial cells, which are generally smaller than plant and animal cells.
5. Conclude that the combination of these characteristics (no nucleus, presence of a cell wall, and small size) is consistent with a bacterium.