Which of the following is the example of Gram-negative bacteria?
Show Hint
- Lactobacillus
- Escherichia coli
- Bacillus subtilis
- Staphylococcus aureus
The Correct Option is B
Solution and Explanation
Gram-negative bacteria are characterized by having a thin peptidoglycan layer and an outer membrane containing lipopolysaccharides. This structure gives them a pink color when subjected to the Gram staining technique. Among the options provided:
1. Lactobacillus: A Gram-positive bacterium, commonly found in probiotics and involved in lactic acid fermentation.
2. Escherichia coli (E. coli): A Gram-negative bacterium found in the gut of warm-blooded organisms. It is distinguished by its thin peptidoglycan wall and outer membrane.
3. Bacillus subtilis: A Gram-positive bacterium, widely studied and used in industrial processes.
4. Staphylococcus aureus: Another Gram-positive bacterium, known for causing infections like MRSA. Thus, the correct answer is Escherichia coli, which is a well-known Gram-negative bacterium.
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