Mitochondria Knowledge-Based Download PDF

Questions

1. 1.

   Which structural feature accounts for the relatively high permeability of the outer mitochondrial membrane to small molecules compared to the inner membrane?

   • A) The abundance of large channel-forming proteins known as porins
   • B) The high concentration of cardiolipin within its lipid bilayer
   • C) The embedded complexes of the electron transport chain
   • D) The presence of extensive internal folds known as cristae
2. 2.

   Which metabolic stage of cellular respiration takes place directly within the mitochondrial matrix of eukaryotic cells?

   • A) Glycolysis
   • B) Oxidative phosphorylation
   • C) Alcohol fermentation
   • D) The citric acid cycle
3. 3.

   During aerobic cellular respiration, which mitochondrial compartment accumulates protons pumped by the electron transport chain to establish the electrochemical gradient necessary for ATP synthesis?

   • A) Mitochondrial matrix
   • B) Intermembrane space
   • C) Outer mitochondrial membrane
   • D) Cytosol
4. 4.

   Which components located within the mitochondrial matrix enable these organelles to synthesize some of their own proteins independently of the cell nucleus?

   • A) Hydrolytic enzymes and transport vesicles
   • B) Porin channels and glycogen granules
   • C) Circular DNA molecules and ribosomes
   • D) Cholesterol molecules and cytoskeletal filaments
5. 5.

   What is the primary functional advantage of the extensive folding of the inner mitochondrial membrane into cristae?

   • A) It increases the membrane surface area available for electron transport chain complexes and ATP synthase.
   • B) It isolates hydrolytic enzymes required for digesting damaged organelles and macromolecules.
   • C) It provides a rigid scaffold that prevents mechanical deformation of the outer mitochondrial membrane.
   • D) It forms physical channels that direct newly translated proteins directly into the Golgi apparatus.