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What is true about viruses without exception?
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- They contain a core of RNA
- They can infect bacteria
- They cannot produce antibodies
- They can multiply only in host cells
Correct Option: D
Viruses do not contain enzymes for energy production or protein synthesis. For a virus to multiply, it must invade a host cell and direct the host’s metabolic machinery to produce viral enzymes, viral proteins, and copies of its nucleic acid, using the host cell's ATP to power the reactions.
