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2 domain system
prokaryotes vs. Eukaryotes
2 issues with germ theory
1. can't culture most bacteria outside of host
2. some organisms don't suffer from same pathogen (immune)
Ex: covid
3' &5' Carbon Atoms
gives direction
,3 domain system
Bacteria, Archaea, Eukarya
3 layers of polysaccharide
1. O antigen- varied
2. core polysaccharide- stable
3. lipid A- toxic
3rd cell theory
All cells come from existing cells (not Schwan and Schleiden)
4-6 cell theory
4. heredity info passed down through cells
5. all cells have basic chemical composition
6. cells possess metabolism (energy flow)
, 1900's top causes of death
1. Pneumonia
2. Tuberculosis
3. Diarrhea
-infectious diseases
1918
spanish influensa
1990
HIV
1997 top causes of death
1. heart disease
2. cancer
3. stroke