Which of the following is NOT a major characteristic that helps differentiate between different streptococcal species? A) Catalase reaction B) Hemolysis on blood agar C) Cell wall... Which of the following is NOT a major characteristic that helps differentiate between different streptococcal species? A) Catalase reaction B) Hemolysis on blood agar C) Cell wall antigens D) Shape and arrangement of cells
Understand the Problem
The question is asking us to identify which characteristic is NOT significant in differentiating between different species of streptococci. The answer will require knowledge of microbiological characteristics of bacteria.
Answer
Catalase reaction
The final answer is A) Catalase reaction
Answer for screen readers
The final answer is A) Catalase reaction
More Information
Streptococci are known to be catalase-negative, so the catalase reaction is not used to differentiate between different streptococcal species. Other factors like hemolysis on blood agar and cell wall antigens are used for differentiation.
Tips
Avoid assuming that all enzyme tests are useful for differentiation. Recognize that the catalase test mainly differentiates between catalase-positive staphylococci and catalase-negative streptococci.
Sources
- Streptococcus - Wikipedia - en.wikipedia.org
- Streptococcus Pyogenes - StatPearls - NCBI Bookshelf - ncbi.nlm.nih.gov
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