The structure of plant, animal, and bacterial viruses are each, fundamentally, very different from one another.

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All viruses, regardless of their host, share a basic structure: genetic material (DNA or RNA) enclosed in a protein coat called a capsid. Some may also have an outer lipid envelope. The variations in structure among plant, animal, and bacterial viruses (bacteriophages) are more about specific adaptations rather than fundamental differences.

The Structure of Plant, Animal, and Bacterial Viruses Are Each