Question:medium
All of the following are non-sporing anaerobes of medical importance except:
All of the following are non-sporing anaerobes of medical importance except:
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Which of these genera famously forms resistant endospores?
Updated On: Jun 24, 2026
- Actinomyces
- Bacteroides
- Clostridia
- Fusobacterium
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The Correct Option is C
Solution and Explanation
Step 1: This is an exception question, so we must spot the single spore-former among a list of anaerobes.
Step 2: Bacteroides and Fusobacterium are Gram negative anaerobic rods that do not form spores, and Actinomyces is a Gram positive filamentous anaerobe that is also non-sporing. All three belong firmly in the non-sporing anaerobe group.
Step 3: Clostridia stand apart because they produce highly resistant endospores, a property that drives diseases such as tetanus, botulism and gas gangrene. As the only spore-former listed, Clostridia is the odd one out.\[\boxed{\text{Clostridia}}\]
Step 2: Bacteroides and Fusobacterium are Gram negative anaerobic rods that do not form spores, and Actinomyces is a Gram positive filamentous anaerobe that is also non-sporing. All three belong firmly in the non-sporing anaerobe group.
Step 3: Clostridia stand apart because they produce highly resistant endospores, a property that drives diseases such as tetanus, botulism and gas gangrene. As the only spore-former listed, Clostridia is the odd one out.\[\boxed{\text{Clostridia}}\]
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