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What type of cell has a single membrane and no nucleus?

  1. Plant cell

  2. Prokaryotic cell

  3. Animal cell

  4. Chemical cell

The correct answer is: Prokaryotic cell

Prokaryotic cells are distinct from eukaryotic cells in that they have a single cell membrane and lack a true nucleus. Option A, plant cells, are eukaryotic cells and therefore have a double membrane and a true nucleus. Option C, animal cells, are also eukaryotic cells and have a double membrane and a true nucleus. Option D, chemical cells, is not a type of cell and is not a correct option. Thus, the only correct answer is option B, prokaryotic cell.