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Notes M - pg.544 KEY CONCEPT Infections can be caused in several ways.

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Presentation on theme: "Notes M - pg.544 KEY CONCEPT Infections can be caused in several ways."— Presentation transcript:

1 Notes M - pg.544 KEY CONCEPT Infections 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 cells 10, ,000 nm viroids nm viruses nm prokaryotics cells ,000 nm prion 2-10 nm

3 Why are some illnesses curable or treatable , while others are not?

4 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

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


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