Streptococci are unable to synthesize which enzyme?

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Prepare for the Clinical Laboratory Science Bacteriology Test. Engage with multiple choice questions and flashcards with helpful hints and explanations. Ace your exam confidently!

Multiple Choice

Streptococci are unable to synthesize which enzyme?

Explanation:
Streptococci are catalase-negative, meaning they cannot synthesize the enzyme catalase. Catalase normally breaks down hydrogen peroxide into water and oxygen, helping cells detoxify reactive oxygen species. Because streptococci lack this enzyme, they do not produce bubbles when exposed to hydrogen peroxide in a catalase test. This absence helps distinguish them from staphylococci, which are catalase-positive and bubble vigorously. While some streptococcal species may produce enzymes like hyaluronidase or streptokinase, those traits are not universal identifiers, whereas catalase negativity is a consistent characteristic of the genus.

Streptococci are catalase-negative, meaning they cannot synthesize the enzyme catalase. Catalase normally breaks down hydrogen peroxide into water and oxygen, helping cells detoxify reactive oxygen species. Because streptococci lack this enzyme, they do not produce bubbles when exposed to hydrogen peroxide in a catalase test. This absence helps distinguish them from staphylococci, which are catalase-positive and bubble vigorously. While some streptococcal species may produce enzymes like hyaluronidase or streptokinase, those traits are not universal identifiers, whereas catalase negativity is a consistent characteristic of the genus.

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