Which of the following statements concerning Staphylococcus aureus is true?

• A. It is a Gram-negative rod commonly found in soil.
• B. It is a Gram-positive coccus that often forms clusters.
• C. It produces endospores as a means of survival under harsh conditions.
• D. It is an obligate anaerobe that cannot survive in the presence of oxygen.

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the morphology and Gram stain characteristics of Staphylococcus aureus. It is important to know whether it is Gram-positive or Gram-negative, and its shape (coccus or rod).
2. Step 2: Recall that Staphylococcus aureus is known to form clusters resembling grape-like bunches, which is a key identifying feature under the microscope.
3. Step 3: Review the ability of Staphylococcus aureus to produce endospores. Determine if this bacterium is capable of endospore formation, which is a survival mechanism in some bacteria.
4. Step 4: Consider the oxygen requirements of Staphylococcus aureus. Identify whether it is an obligate anaerobe, facultative anaerobe, or obligate aerobe.
5. Step 5: Based on the above characteristics, evaluate each statement to identify which one correctly describes Staphylococcus aureus.