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20 Cards in this Set

  • Front
  • Back
List 4 phases of bacterial growth.
death phase
In the lag phase bacteria have the highest metabolic activity but without cell division. TRUE/FALSE
During which phase is bacterial growth fastest?
Log phase
It is the Lag phase in which beta-lactam drugs act. TRUE/FALSE
False. It is the Log phase.
What is a unique feature of the Stationary phase?
Bacterial growth equals that of bacterial death.
Spores form in the stationary phase. TRUE/FALSE
In the death phase nutrient sources have been exhausted. TRUE/FALSE
How are bacteria groups divided regarding oxygen requirements?
1. Obligate aerobes(Pseudomonas)
2. Facultative anerobes(Listeria, Enterobacteriae)
3. Microaerophilic(low O2 tension)(Campylobacter)
4. Aerotolerant anerobes(Enterococcus fecalis)
5. Obligate anerobes.
List 4 obligate aerobe bacteria.
1. Nocardia(G+)
. 2.Neisseria/Pseudomonas/Bordetella/Legionella/Brucella
3. Mycobacterium/Nocardia/(Acid fast)
List three obligate anerobes.
Clostridium/ Actinomyces(Gram+)
Superoxide dismutase, catalase and peroxidase are what?
They are enzymes that obligate aerobes require to use O2.
What molecule does superoxide dismutase break down?
Superoxide(O2-) into H2O2.
Which molecule does catalase/peroxidase breakdown?
H2O2 into H2O.
Exactly why do obligate aerobes require O2?
Because their metabolism requires O2 as the final electron acceptor. They use glycolysis, the TCA and the electron transport chain.
How are Obligate aerobes different from facultative anerobes?
Facultative anerobes are aerobic bacteria that contain catalase and superoxide dismutase, so they can use O2 as obligate aerobes. They may grow as well in the absence of O2 by using fermentation for energy.
Can microaerophilic bacteria generate ATP?
Yes. Only through fermentation. They do not possess an electron transport system.
How do microaerophilic bacteria tolerate low levels of O2?
They possess superoxide dismutase, but no catalase.
Why exactly are obligate anerobes unable to grow in the presence of O2?
They do not have enzymes such as superoxide dismutase, catalase, or peroxidase to protect them from free O2 radicals.
Can obligate intracellular organisms generate their own ATP?
NO. They must utilize the ATP of a host T cell. They can survive only within the host cell.
List some facultative intracellular organisms.
Brucella/ Salmonellatyphi/Listeria monocytogenes/Yersinia/Franciscella tularensis/Legionella.