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Micro & Immunology · single question

A 2-day-old developing plaque consists primarily of ____________________.

  1. Treponema species
  2. Porphyromonas gingivalis
  3. Gram-positive cocci and rods
  4. Filamentous organisms
  5. A structureless, non-mineralized pellicle
Show answer and explanation

Correct answer: C. Gram-positive cocci and rods

Plaque formation: pellicle forms within seconds; by 2 days, gram-positive cocci and rods (early colonizers like S. sanguis and S. mutans) dominate. Treponema, P. gingivalis, and filamentous forms appear only in weeks-old mature plaque.

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