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nmdcat.online July 3, 2026

100. The fundamental difference between the extracellular matrix (ECM) of animal tissues and the cell wall of plant tissues is that the animal ECM is dominated by

A. Rigid crystalline homopolysaccharides
B. Flexible fibrous proteins (like collagen and elastin) embedded in a glycosaminoglycan gel
✓
C. Waterproof aromatic polymers like lignin
D. Highly ionized phosphate backbones

📝 Explanation

Animal cells secrete a protein-rich extracellular matrix (featuring collagen, fibronectin, and laminin) that provides structural support while remaining flexible, unlike the carbohydrate-dominated cell walls of plants.

📖 Additional Information

  • Rigid crystalline homopolysaccharides
  • Flexible fibrous proteins (like collagen and elastin) embedded in a glycosaminoglycan gel
  • Waterproof aromatic polymers like lignin
  • Highly ionized phosphate backbones

Animal cells secrete a protein-rich extracellular matrix (featuring collagen, fibronectin, and laminin) that provides structural support while remaining flexible, unlike the carbohydrate-dominated cell walls of plants.

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