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

86. An experimental plant cell line contains a loss-of-function mutation in the gene encoding the enzyme cellulose synthase. During cell division and growth, this molecular defect will directly manifest as the

A. Inability of the cell to replicate its mitochondrial DNA
B. Structural failure and bursting of newly formed daughter cells during expansion
✓
C. Failure of the spindle apparatus to segregate sister chromatids
D. Sudden transformation of chloroplasts into amyloplasts

📝 Explanation

Without functional cellulose synthase complexes, the cell cannot build a primary cell wall, causing expanding cells to burst under turgor pressure.

📖 Additional Information

  • Inability of the cell to replicate its mitochondrial DNA
  • Structural failure and bursting of newly formed daughter cells during expansion
  • Failure of the spindle apparatus to segregate sister chromatids
  • Sudden transformation of chloroplasts into amyloplasts

Without functional cellulose synthase complexes, the cell cannot build a primary cell wall, causing expanding cells to burst under turgor pressure.

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