Microcheck 148

Plant viruses cause many plant diseases and are of major economic importance. They invade through wound sites in the cell wall, and humans are major vectors for their transmission. Some viruses can multiply in both plants and insects.

■ Why is it especially important for plant viruses to be stable outside the plant?

■ How does a plant virus penetrate the tough outer coat of the plant cell?

■ Why is it surprising that some viruses have the ability to replicate in both plants and animals?

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