Lecture 11: The Prokaryotes: Domains Bacteria & Archaea

Question 1

What are proteobacteria?

Answer 1

Gram-negative, chemehetertrophic bacteria that possess a specific rRNA sequence

Question 2

What are the 5 classes of proteobacteria?

Answer 2

1. Alphaproteobacteria
2. betaproteobacteria
3. gammaproteobacteria
4. deltaproteobacteria
   5.epsilonproteobacteria

Question 3

What are common characteristics of alphaproteobacteria?

Answer 3

• grow w/ very low levels nutrients
• some have stalks or buds called prosthecae
• include agriculturally important bacteria

Question 4

What is the difference between Pelagibacter, Ehrlichia, Rhizobium, Bartonella, and Brucella?

Answer 4

Pelagibacter: one of most abundant microorganisms
Ehrlichia: transmitted by ticks; infection in canines
Rhizobium: fix nitrogren in roots
bartonella: cat scratch disease
Brucella: obligate parasite of mammals

Question 5

What is notable about betaproteobacteria?

Answer 5

play a role in nitrogen fixation

Question 6

What are the differences between burkholderia, bordetella, neisseria?

Answer 6

burkholderia: b. pseudomallei-causes meliodosis in humans
bordetella: B.pertussis- causes whooping cough
neisseria: N.gonnorheae & N.meningitis (explanatory)

Question 7

What is notable about gammaproteobacteria?

Answer 7

generally have different shapes, include free living bacteria

Question 8

What is the difference between francisella, Pseudomonadales, Legionella, V. Cholerae, V. parahaemolyticus, Enterobacteriales, E.coli, and Salmonella?

Answer 8

francisella: F. tularensis- causes tularemia
Pseudomonadales: pseudomonas - opportunistic pathogens
Legionella: causes pneumonia
V. cholera: causes cholera
V. parahaemolyticus: causes gastroenteritis
Enterobacteriales: enterics; inhabit intestinal tract; cause uti
E.coli: indicator of fecal contamination
salmonella: 2,500 serovars

Question 8

What is the difference between shigella, klebsiella, serratia, yersinia, and haemophilus?

Answer 8

shigella: causes baccilary dysentery
klebsiella: K. pneumoniae causes pneumonia
serratia: produces red pigment; cause of nosocomial infections
yersinia: y. pestis causes plague
haemophilus: H. influenza causes meningitis (does NOT cause influenza)

Question 9

What is unique about Deltaproteobacteria?

Answer 9

include bacteria that are predators on other gram-neg bacteria
important to sulfer cycle

Question 10

What is the differences between Bdellvibrio, Desulfovibrio, & Myxococcals?

Answer 10

Bdell: attack other gram-neg bacteria
Desu: found in anaerobic tract
Myxococcals: form fruiting body containing myxospores

Question 11

What are the differences between these epsilonproteobacteria: campylobacter & helicobacter?

Answer 11

Campy: common bacterial cause of diarrheal illness
Helico: causes stomach cancer (H. pylori)