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Mitochondria Knowledge-Based Practice

Biology · Cell Structure & Function · Biology · Organelles

5 Biology practice questions on Mitochondria. Questions that assess core concepts and understanding.

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Questions

  1. 1.

    Which structural feature distinguishes the outer mitochondrial membrane from the inner mitochondrial membrane, rendering it freely permeable to small solutes and ions?

    • A) A high concentration of cardiolipin that forms non-selective aqueous channels
    • B) The presence of embedded ATP synthase complexes that allow passive diffusion
    • C) The presence of pore-forming transmembrane proteins known as porins
    • D) The complete absence of integral transport proteins within the lipid bilayer
  2. 2.

    During aerobic respiration, protons are actively pumped across the inner mitochondrial membrane and accumulate in which compartment to create the electrochemical gradient that powers ATP synthase?

    • A) Intermembrane space
    • B) Mitochondrial matrix
    • C) Cytosol
    • D) Peroxisomal lumen
  3. 3.

    Which of the following structural and genetic features provides direct evidence supporting the endosymbiotic origin of mitochondria?

    • A) The ability to synthesize organic sugars from carbon dioxide
    • B) The presence of linear chromosomes wrapped around histone proteins
    • C) An outer boundary composed of a single phospholipid monolayer
    • D) The possession of their own circular DNA and bacterial-like 70S ribosomes
  4. 4.

    Which of the following metabolic processes takes place primarily within the mitochondrial matrix?

    • A) Glycolytic breakdown of glucose
    • B) Citric acid cycle (Krebs cycle)
    • C) Conversion of pyruvate to lactate
    • D) Carbon fixation via the Calvin cycle
  5. 5.

    Which of the following statements correctly describes the functional significance of the extensively folded inner membrane (cristae) of a mitochondrion?

    • A) It provides an increased surface area for the electron transport chain complexes and ATP synthase.
    • B) It forms a selective barrier that packages and modifies newly synthesized polypeptides for extracellular export.
    • C) It sequesters hydrolytic enzymes in an acidic compartment to degrade damaged organelles and cellular debris.
    • D) It synthesizes membrane lipids and steroids while detoxifying lipid-soluble metabolic byproducts.

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