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BIO NMDCAT Cytoplasmic Organelles
nmdcat.online July 4, 2026

69. The selective import of nuclear-encoded precursor proteins into the mitochondrial matrix requires sequential translocation through the structural gates designated as the

A. Sec61 and Sec62 translocon complexes
B. TOM and TIM outer/inner membrane complexes
✓
C. Importin and exportin transport channels
D. Nuclear pore central transporter rings

📝 Explanation

Nuclear-encoded mitochondrial proteins use the Translocase of the Outer Membrane (TOM) and Translocase of the Inner Membrane (TIM) to cross both bilayers.

📖 Additional Information

  • Sec61 and Sec62 translocon complexes
  • TOM and TIM outer/inner membrane complexes
  • Importin and exportin transport channels
  • Nuclear pore central transporter rings

Nuclear-encoded mitochondrial proteins use the Translocase of the Outer Membrane (TOM) and Translocase of the Inner Membrane (TIM) to cross both bilayers.

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