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BIO NMDCAT CELL STRUCTURE & FUNCTION
nmdcat.online July 3, 2026

35. The biochemical nature of the middle lamella that acts as a structural adhesive binding adjacent plant cell walls together is primarily a polymer of

A. Highly hydrophobic fatty acids
B. Polygalacturonic acid (pectin salts)
✓
C. Cross-linked alpha-keratins
D. Long-chain unbranched chitins

📝 Explanation

The middle lamella is rich in pectin salts (calcium and magnesium pectates), which cross-link to form a sticky, cementing extracellular layer.

📖 Additional Information

  • Highly hydrophobic fatty acids
  • Polygalacturonic acid (pectin salts)
  • Cross-linked alpha-keratins
  • Long-chain unbranched chitins

The middle lamella is rich in pectin salts (calcium and magnesium pectates), which cross-link to form a sticky, cementing extracellular layer.

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