The single-celled organism Thiomargarita namibiensis measures 700μm in diameter and is enclosed in a cell wall. The genetic material of T. namibiensis is located free in the cytoplasm where it occurs as thousands of copies of circular DNA. Most of the cell is taken up by a large vacuole, which stores essential chemicals for metabolism.
Which statement is correct?
1 )
It must be a eukaryote because a diameter of 700μm is too large for a prokaryote.
2 )
It must be a plant because it contains a vacuole.
3 )
It must be a plant because it is enclosed in a cell wall.
It must be a prokaryote because its DNA is circular and located in the cytoplasm.
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