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BIO NMDCAT Cytoplasmic Organelles
nmdcat.online July 4, 2026

71. During a laboratory experiment, a cell line exhibiting a complete absence of the TIM23 inner membrane complex is found to be entirely incapable of importing

A. Soluble proteins into the mitochondrial matrix space
✓
B. Lipids from the smooth endoplasmic reticulum
C. mRNA molecules into the nucleolus matrix
D. Secretory vesicles into the trans-Golgi network

📝 Explanation

The TIM23 complex is the primary translocase channel that threads unfolded precursor proteins across the inner mitochondrial membrane into the matrix.

📖 Additional Information

  • Soluble proteins into the mitochondrial matrix space
  • Lipids from the smooth endoplasmic reticulum
  • mRNA molecules into the nucleolus matrix
  • Secretory vesicles into the trans-Golgi network

The TIM23 complex is the primary translocase channel that threads unfolded precursor proteins across the inner mitochondrial membrane into the matrix.

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