The Unknown Practicum II Flashcards
Obligate aerobes
Organisms that require oxygen to live
Facultative Anaerobes
Bacteria that have developed or retained the ability to continue growing in the absence of oxygen. They use oxygen if present but continue growth by fermentation or anaerobic respiration when no oxygen is available. (Energy decreases in absence of oxygen)
Obligate anaerobes
Bacteria unable to use oxygen for energy yielding reactions (Most are harmed by it)
Singlet Oxygen?
Higher energy state that cause oxygen to be extremely reactive. (Toxic form of oxygen)
Superoxide Radicals
Oxygen that unstable and causes molecules to steal electrons. Organisms must have SOD to neutralize them
Superoxide dismutase? (SOD)
An enzyme that converts the superoxide radical into molecular oxygen (02) and (H2O2)
Superoxide dismutase? (SOD)
An enzyme that converts the superoxide radical into molecular oxygen (02) and (H2O2)
Catalase?
An enzyme that neutralizes the peroxide anion into water and oxygen.
Peroxidase?
Breaks down hydrogen peroxide. (doesn’t produce oxygen)
Aerotolerant Anaerobes?
Don’t use oxygen for growth but tolerate it well. Ferment carbohydrates into lactic acid.
Microaerophiles?
Aerobic, they require oxygen but at extremely low amounts
Organic growth factors?
Essential organic compounds an organism is unable to synthesize and must be obtained from the environment.
The only staphylococcus that is coagulase positive?
S. Aureus
Beta-Hemolytic?
Clear, complete lysis of red cells.
Alpha-hemolytic?
incomplete lysis, seen with green hemolysis.
