Microbiology : Chapter 11

Largest taxonomic group of bacteria

Phylum Proteobacteria Relationship between members is based on

___ is most capable of growing at low levels of nutrients

___ have unusual morphologies

Includes nitrogen fixers

___ are several plant and animal pathogens

Intracellular human parasite

___ Produce acetic acid from alcohol

Grow in soil, using nutrients excreted by plants & Fix nitrogen

___ Fix nitrogen in the roots of plants

Agrobacterium

Alphaproteobacteria (gram -tive)

Often use nutrients of anaerobic decomposition such as ammonium, Hydrogen gas, and methane

___ Has Several important pathogens in this group

Thiobacillus is a chemoautotrophic which oxidize ___

___ is a chemoheterotophic which form sheaths

Causes gonorrhea

Cause whooping cough

5 Betaproteobacteria are

This is the largest subgroup of proteobacteria.There are a wide variety of physiological types including many pathogens

___ causes cholera

___causes gastroenteritis

Found in streams, warm-water pipes, cooling towers

Q fever transmitted via aerosols or milk

Enterobacteriales

Pseudomonas are

Legionellales

___ Contains bacteria that are predators of other bacteria, Sulfur reducers

___ Involved in Earth’s “Sulfur cycle”

Order Desulfovibrionales

___ found in human intestines & anaerobic sediments

Obligate anaerobes producing H2S gas

Prey on other bacteria

Helical or vibroid, Gram-negative rods
motile by flagella
microaerophillic

Multiple flagella, Causes Peptic ulcers, Stomach cancer

One polar flagellum - Gastroenteritis

Oxygenic photosynthesis
2H₂O+CO₂ -light-> CH₂0+H₂O+O₂

Anoxygenic photosynthesis
2H₂S+CO₂ -light-> CH₂0+H₂O+2S⁰

A bacteria known as Algea for long time

Purple sulfur
Purple nonsulfur
Green sulfur
Green nonsulfur