18 Questions
Which type of organisms can grow either in the presence or absence of oxygen?
Facultative anaerobes
What is the key characteristic of aerotolerant anaerobes?
They can perform metabolic processes in an anaerobic environment
Which organism requires 2% to 10% Oxygen for growth?
Propionibacterium acnes
What enzymes do obligate aerobes and facultative anaerobes contain to counter the toxic effects of oxygen?
Superoxide dismutase and catalase
Which organisms use light as their energy source?
Phototrophs
What type of organisms utilize the energy produced by organic compounds?
Heterotrophs
What is the ideal temperature for promoting the growth of anaerobes?
37°C
How long does it take to achieve an anaerobic environment in a Gas Pak Jar?
30-45 minutes
What indicates the proper functioning of the catalyst when using a Gas Pak Jar?
Presence of water vapor inside the jar
What can be a reason for a failure to achieve an anaerobic condition in an anaerobic jar?
A 'poisoned' catalyst
What is a disadvantage of using an anaerobic jar for culturing bacteria?
Plates need to be removed for examination
How long might it take for the methylene blue indicator to change color in a Gas Pak Jar?
Hours
Which of the following is NOT a physiological requirement of bacteria?
Sunlight
Which type of bacteria absolutely do not require the presence of oxygen and die after prolonged exposure?
Obligate anaerobes
Which bacteria require the presence of oxygen to grow and thrive?
Aerobes
What is the range of oxygen content in room air where some bacteria grow well?
15% to 21%
Which bacteria can thrive in both the presence and absence of oxygen?
Facultative anaerobes
What is a characteristic example of an obligate anaerobe among bacteria?
Clostridium
Learn about different types of organisms based on their growth in the presence or absence of oxygen, including aerobes, microaerophiles, and aerotolerant anaerobes.
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