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Infectious proteins that cause degenerative brain diseases in animals

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Circular RNA molecules that infect plants, causing errors in the regulatory systems that control plant growth

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A global epidemic

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A widespread outbreak of a disease

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A harmless variant or derivative of a pathogen that stimulates the immune system to mount defenses against the harmful pathogen

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Viruses, viroids, and prions are formidable pathogens in animals and plants

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A viral genome that is permanently inserted into a host genome

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Caused by the retrovirus HIV

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The retrovirus that causes AIDs

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An enzyme which transcribes an RNA template into DNA

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An RNA virus that replicates by transcribing its RNA into DNA and then inserting the DNA into a cellular chromosome

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Viral DNA when it is integrated into the bacterial chromosome

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Phages capable of using both the lytic and lysogenic cycles

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Allows replication of the phage genome without destroying the host

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Used as a defense mechanism against viruses, bacteria can release restriction enzymes to cut up the bacteriophage's DNA

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a phage that replicates only by a lytic cycle

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The last stage of viral infection during which the host cell breaks open and releases the phages that were produced in the cell

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Each virus can only infect the cells of a limited number of species

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Viruses replicate only in host cells

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Viruses that infect bacteria

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A membrane derived from membranes of the host cell that cloaks the capsid

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the protein coating enclosing the viral genome

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A virus consists of a nucleic acid surrounded by a protein coat

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An infectious particle comprised of genes packed in a protein coat; classified as a DNA virus or RNA virus