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What are viruses? Viruses are very small particles that can infect animals and plants and make them sick. Viruses are made up of genetic materials like DNA and are protected by a coating of protein. Viruses hijack the cells of living organisms. They inject their genetic material right into the cell and take over.

Biology4Kids.com! This tutorial introduces viruses. Other sections include plants, animal systems, cells, vertebrates, and invertebrates.

Watch the first minute/minute and a half to learn about viruses.

Learn about the basics of biology including viruses, with KidsBiology.com. Biology For Kids.