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2015-09-07T21:36:02+08:00
2015-09-07T21:39:01+08:00

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The answer is letter D, the cells have a cell membrane . Not all cell have a cell wall, (only plant cell contains cellwall) . Not all cells contains chloroplast ( chloroplast present only in plant cell ) not all cell contains nucleus (prokaryotic cell is not containing nucleus) so, the always true is letter D, because it is known as semi permiable barrier and fluid mosaic model.
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