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Questions and Answers
Which type of bacteria are pseudomonads?
Which type of bacteria are pseudomonads?
- Gram-positive rods
- Gram-negative cocci
- Gram-negative rods (correct)
- Gram-positive cocci
What distinguishes pseudomonads from members of the Enterobacteriaceae?
What distinguishes pseudomonads from members of the Enterobacteriaceae?
- They are strict anaerobes
- They are facultative aerobes
- They are strict aerobes (correct)
- They are facultative anaerobes
What is the significance of pseudomonads not fermenting glucose?
What is the significance of pseudomonads not fermenting glucose?
- They produce pyocyanin
- They are called non-fermenters (correct)
- They are obligate anaerobes
- They are spore-forming
What favors the persistence of pseudomonads in the hospital environment?
What favors the persistence of pseudomonads in the hospital environment?
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What pigments are produced by Pseudomonas aeruginosa?
What pigments are produced by Pseudomonas aeruginosa?
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Study Notes
Pseudomonads
- Pseudomonads are a type of Gram-negative, aerobic bacteria.
Distinction from Enterobacteriaceae
- Pseudomonads are distinguished from members of the Enterobacteriaceae family by their ability to oxidize carbohydrates rather than ferment them.
Glucose Non-Fermentation
- Pseudomonads do not ferment glucose, which signifies their ability to thrive in environments with limited nutrients.
- This characteristic is significant because it allows pseudomonads to persist in environments where other bacteria may not survive.
Persistence in Hospital Environment
- The persistence of pseudomonads in the hospital environment is favored by the presence of moist environments, such as sinks and humidifiers, and the use of broad-spectrum antibiotics.
Pseudomonas aeruginosa Pigments
- Pseudomonas aeruginosa produces two pigments: pyocyanin (blue-green) and pyoverdin (yellow-green).
- These pigments contribute to the bacterium's ability to colonize and cause infection in the human body.
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