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Which of the following is not a postulate of cell theory?


Options:
A .   Cell is the basic unit of life.
B .   All cells develop from pre-existing cells.
C .   All living organisms are composed of cells.
D .   All living cells have cell walls.
Answer: Option D
:
D

The main postulates of cell theory are:


• All living organisms are composed of one or more cells.


• Cell is the basic unit of structure, function, and organisation in all organisms.


• All cells come from pre-existing, living cells.


All living cells do not have cell walls. It is present only in plants, fungi and bacteria. 

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