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BIO NMDCAT Sexually transmitted diseases
nmdcat.online July 16, 2026

Regarding the structural adaptations of pathogens causing STDs, the spirochete structure of Treponema pallidum is evolutionarily advantageous primarily because it allows the bacterium to:

A. Resist phagocytosis by macrophages
B. Survive extended periods outside the human body
C. Execute a corkscrew motility to penetrate viscous tissues
✓
D. Synthesize its own metabolic enzymes

📝 Explanation

The correct option is Execute a corkscrew motility to penetrate viscous tissues. The spiral shape and internal axial filaments give the spirochete unique motility, allowing it to drill into mucous membranes and disseminate quickly into the host's tissues and bloodstream.

📖 Additional Information

  • Resist phagocytosis by macrophages
  • Survive extended periods outside the human body
  • Execute a corkscrew motility to penetrate viscous tissues
  • Synthesize its own metabolic enzymes

The correct option is Execute a corkscrew motility to penetrate viscous tissues. The spiral shape and internal axial filaments give the spirochete unique motility, allowing it to drill into mucous membranes and disseminate quickly into the host's tissues and bloodstream.

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