Question

Organisms belongs to the genus bacteroides are:

• A. Chemoautotrophs, aerobic and gram positive.
• B. Causative agents of Lyme diseases.
• C. Anaerobic, gram-negative, nonspore-forming rods and usually nonmotile.
• D. Not able to degrade cellulose, pectins, and other complex carbohydrates.

Hint:

When you see Bacteroides, immediately think "gut anaerobe." They are the dominant Gram-negative anaerobes in the human colon, and their claim to fame is digesting the complex carbs (fiber) in our diet.

Answer 1

The Correct Option is C

Step 1: Concept Overview:
The question requires identifying the accurate description of bacteria within the genus Bacteroides, a significant component of mammalian gut microbiota.
Step 2: Detailed Analysis:
Evaluating each option:


(A) Chemoautotrophs, aerobic and gram positive: Incorrect. Bacteroides are chemoheterotrophs, obligate anaerobes, and Gram-negative.

(B) Causative agents of Lyme diseases: Incorrect. Lyme disease is caused by Borrelia burgdorferi.

(C) Anaerobic, gram-negative, nonspore-forming rods and usually nonmotile: Correct. This accurately describes Bacteroides, which thrive in the anaerobic environment of the large intestine.

(D) Not able to degrade cellulose, pectins, and other complex carbohydrates: Incorrect. Bacteroides are known for their ability to ferment and degrade complex plant polysaccharides indigestible by humans, a key ecological role in the gut.

Step 3: Conclusion:
Option (C) provides the most accurate description of Bacteroides.