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

92. A plant developmental biologist studies a mutant strain of Arabidopsis thaliana that lacks functional expansin proteins. Phenotypically, this mutation results in severe dwarfism because expansins are the mandatory wall proteins that

A. Catalyze the synthesis of secondary lignin complexes
B. Loosen the hydrogen bonds between cellulose microfibrils to permit turgor-driven wall extension
✓
C. Replicate the circular genome of internal chloroplasts
D. Anchor the desmotubule inside the plasmodesmata pores

📝 Explanation

Expansins disrupt the non-covalent links between cellulose and hemicellulose, allowing turgor pressure to expand the primary cell wall.

📖 Additional Information

  • Catalyze the synthesis of secondary lignin complexes
  • Loosen the hydrogen bonds between cellulose microfibrils to permit turgor-driven wall extension
  • Replicate the circular genome of internal chloroplasts
  • Anchor the desmotubule inside the plasmodesmata pores

Expansins disrupt the non-covalent links between cellulose and hemicellulose, allowing turgor pressure to expand the primary cell wall.

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