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Chapter 28 Lecture

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University of Toronto Mississauga
Christoph Richter

Lecture 4 Chapter 28 Lecture Bacteria and Archaea The plague spread across Europe  Started 1346 and in a short time frame, sprat across Europe  75-2 million people died (approx. half of Europe’s population at that time) Why no cure?  They didn’t know the cause of it  Plague is a bacterium and didn’t have a microscope  Had no means to find out what caused the disease  Hygiene wasn’t complementally back then so it was easy for bacteria to attack Are Bacteria Really All Bad?  Cyanobacteria Without Cyanobacteria There Would Not Be Enough Oxygen  On the y-axis atmospheric oxygen  Start off with low oxygen, and only rose when there was a small cyanobacteria growth Presence of Oxygen was a Crucial Step  Most effective in cellular respiration Bacteria can live 1km Below the Earth’s Surface  Recently found this piece of information  They have a different biochemistry from te organism we are used to that live on the surface Archaea Specialize on living in places that seem impossible  Methanopyrus Euryarchaeota  Recently found There Are Places Where The Sun Don’t Shine  2000 meter water depth (no sun whatsoever) therefore pitch black  They have to rely on completely different way of living and surviving  Up to 400 degrees Celsius  Have huge number of prokaryotes living in groups down there Bacteria and Archaea Differ in a
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