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Cell theory is not applicable to

Option: 1

Bacteria


Option: 2

Fungus


Option: 3

Algae


Option: 4

Virus


Answers (1)

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Viruses lack the conventional structure of a cell and do not execute any cell tasks, hence cell theory does not apply to viruses. Therefore, the correct answer is option 4 which is Virus.

Option (A),(B), and (C) are incorrect because bacteria, algae, and fungi are unicellular and multicellular creatures that have distinct cellular structures with cell organelles, generate energy by burning food, and reproduce. As a result, all living entities fall under the purview of cell theory.

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