19d • Multiple choice answers
🧪 Answer Reveal: Recall Poll #2
Question: A Gram-positive rod shows club-shaped morphology and is arranged in “Chinese letters.” Which additional feature would help confirm its identity?
✅ Correct Answer: B) Metachromatic granules
👏 Shoutout to the member who voted! 🎉
🧠 Explanation:
The clues point to:
👉 Corynebacterium diphtheriae
This organism is classically known for:
✔ Gram-positive rods
✔ Club-shaped appearance
✔ “Chinese letter” arrangement
✔ Metachromatic (Babes-Ernst) granules
The presence of metachromatic granules is one of the most characteristic laboratory findings used to support identification.
🔬 Why not the other options?
A) Coagulase positive ❌
• Associated with Staphylococcus aureus• Not Corynebacterium
C) Indole positive ❌
• Commonly used for identification of certain Gram-negative rods
D) Urease negative ❌
• Not a classic hallmark feature used to identify C. diphtheriae
💡 Quick Recall Tip:
Think FAST 👇
🦠 Club-shaped rods
🇨🇳 Chinese-letter arrangement
✨ Metachromatic granules
➡️ Corynebacterium diphtheriae
🔥 High-Yield ASCP Clue:
If you see club-shaped Gram-positive rods arranged in palisades or Chinese letters, the next clue to look for is metachromatic granules.
👇 Did you get it right before the reveal?
Drop a 🧫 below!
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🧪 Answer Reveal: Recall Poll #2
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