Educational worksheet on virus biology and structure, featuring diagrams and labeling exercises.

Diagram showing the biology and structure of viruses, including labeled parts like capsid, nucleic acid, and envelope, with illustrations of a bacteriophage, a plant virus, and a rod-shaped virus.

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1. Viruses are made up of nucleic acids encapsulated by a coat of protein.
2. Unlike bacteria, viruses are not composed of cells.
3. They only become required for life if host cells can perform their functions.
4. Proteins on viral surfaces protect against the host immune system and allow attachment to host cells.
5. Name three viral diseases: influenza, HIV/AIDS, measles.
6. A virus that infects bacteria is called a bacteriophage.
7. Two easily seen differences between the two viruses shown are their shape (polyhedral vs. helical) and the presence or absence of an envelope.

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