A-LevelBiologyCell structure9700/12 · Oct/Nov 2021 · Q61 Mark
The single-celled organism Thiomargarita namibiensis measures 700 µm 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?
AIt must be a eukaryote because a diameter of 700 µm is too large for a prokaryote.
BIt must be a plant because it contains a vacuole.
CIt must be a plant because it is enclosed in a cell wall.
DIt must be a prokaryote because its DNA is circular and located in the cytoplasm.
✓ Correct answer
D: It must be a prokaryote because its DNA is circular and located in the cytoplasm.
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