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Question
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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