Question Detail
Question
Which of the following is a typical Gram-positive bacterium?
Correct Answer
Option B is the correct answer.
Detailed Explanation
Staphylococcus spp. (e.g., Staphylococcus aureus) are well-known Gram-positive bacteria, characterized by a thick peptidoglycan layer that retains the crystal violet stain. Neisseria spp., Escherichia coli, and Salmonella spp. are all Gram-negative bacteria.
Hint
Recall the classification of common bacterial genera based on Gram staining. Gram-positive bacteria typically have a thick cell wall.