The cell theory is not applicable to
A. Bacteria
B. Algae
C. Virus
D. Fungi

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Detailed Solution

A virus is essentially a protein coat enclosing a piece of DNA or RNA. While viruses can exist, adapt to the environment, and respond to stimuli, they depend entirely on a host for their life cycle. They do not grow and lack the basic characteristics of cells.

In contrast, bacteria, algae, and fungi have a definite and complex cellular structure and can reproduce independently without relying on a host.

Since viruses are not made of cells, lack cellular structures, and do not use cells for growth or reproduction, they cannot be classified under the cell theory. Viruses do not exhibit basic cellular organization like bacteria, algae, or fungi.

Conclusion: The cell theory does not apply to viruses, making them exceptions to this biological principle.

Correct answer: Option (C)

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