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Which of the following statements is always true?
a. All cells have a cell wall.
c. All cells contain a chloroplast.
b. All cells contain a nucleus.
d. All cells have a cell membrane.


Sagot :

100percentcorrectidn
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.