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KEY CONCEPT Infections can be caused in several ways.

KEY CONCEPT Infections can be caused in several ways. Viruses, bacteria, viroids, and prions can all cause infection. Any disease-causing agent is called a pathogen. 1 nanometer (nm) = one billionth of a meter. 100 nm. eukaryotics cells 10,000-100,000 nm. viroids 5-150 nm. viruses 50-200 nm.

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KEY CONCEPT Infections can be caused in several ways.

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  1. KEY CONCEPTInfections can be caused in several ways.

  2. Viruses, bacteria, viroids, and prions can all cause infection. • Any disease-causing agent is called a pathogen. 1 nanometer (nm) = one billionth of a meter 100 nm eukaryotics cells10,000-100,000 nm viroids5-150 nm viruses50-200 nm prokaryotics cells200-10,000 nm prion2-10 nm

  3. A virus is made of DNA or RNA and a protein coat. • non-living pathogen • can infect many organisms • A viroid is made only of single-stranded RNA. • causes disease in plants • passed through seeds or pollen

  4. causes misfolding of other proteins • results in diseases of the brain • A prion is made only of proteins.

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