Question

multiple choice question

which term refers to microbes that do not use oxygen gas, but are not affected by its presence?

obligate aerobes
obligate anaerobes
aerotolerant anaerobes
facultative anaerobes

Explanation:

Analyze the definition of each option

• Obligate aerobes: Require oxygen for growth and metabolism.
• Obligate anaerobes: Cannot grow in the presence of oxygen; it is toxic to them.
• Aerotolerant anaerobes: Do not use oxygen for growth or metabolism, but are not harmed or affected by its presence.
• Facultative anaerobes: Use oxygen if it is present, but can grow without it by switching to fermentation or anaerobic respiration.

Match the definition to the question stem

• The question asks for microbes that "do not use oxygen gas, but are not affected by its presence."
• This matches the definition of aerotolerant anaerobes.

Answer:

• Obligate aerobes
• Obligate anaerobes
• Aerotolerant anaerobes (Correct answer)
• Facultative anaerobes