BACTERIA. CLS 212: Medical Microbiology Miss Zeina Alkudmani. Prokaryotes. Prokaryotic cells possess simpler structures than eukaryotic cells , since they do not have a nucleus or other cytoplasmic organelles. There are two major types of prokaryotes: Bacteria.
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CLS 212: Medical Microbiology
are often found in extreme environments, and while they are clearly prokaryotic, they have evolved separately from bacteria.
o Bacteria are the most abundant organisms on earth, found
everywhere; air, water, soil, rocks (live bacteria even found
in rocks more than a mile below earth's surface)
o Billions per gram of fertile soil (will measure this in lab)
o Humans contain 1014 bacterial cells, 1013 human cells; 10%
of dry weight of humans is bacterial (mostly in large
intestine). Feces is 1/3 bacteria.
Class Gamma Proteobacteria
Species Escherichia coli
The cell envelope is made up of two to three layers:
of bacteria an outer
A Layer of phospholipids and proteins (lipid bilayer), encloses the interior of the bacterium, regulating the flow of materials in and out of the cell.
Color of Bacteria:Blue-violet
Color of Bacteria:RED
circular chromosome that is
responsible for replication,
although a few species do
have two or more.