Exam-answeres

1. Three of the five factors are:
a). Longevity dominance: bacteria live on earth around 3.5 billion yrs ago. A single bacterium can survice up to million of yrs.
b). Environmental dominance: Bacteria created about 20% O2 atmosphere thru photosynthesis.
c). Infectious diseases: In top 2 leading causes of death for human.
Hoa Le

2. Four components of of Koch's Postulates are:
a). Must find microbe in every patient w/ disease
b). Must take sample of microbe from patient grow in pure culture
c). Inoculate healthy animal w/ microbe, see same symptoms
d). must then be able to culture same microbe from expt: infected animal
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