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

The causative agent of syphilis, Treponema pallidum, possesses a distinct morphological structure that facilitates its movement through viscous environments such as mucous membranes. This bacterium is morphologically classified as a:

A. Gram-negative diplococcus
B. Spirochete
✓
C. Gram-positive bacillus
D. Retrovirus

📝 Explanation

The correct option is Spirochete. Treponema pallidum is a thin, tightly coiled spirochete with endoflagella (axial filaments) that allow a corkscrew motion, enabling it to penetrate intact mucous membranes. Neisseria is a diplococcus.

📖 Additional Information

  • Gram-negative diplococcus
  • Spirochete
  • Gram-positive bacillus
  • Retrovirus

The correct option is Spirochete. Treponema pallidum is a thin, tightly coiled spirochete with endoflagella (axial filaments) that allow a corkscrew motion, enabling it to penetrate intact mucous membranes. Neisseria is a diplococcus.

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