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Chloroplasts Knowledge-Based Practice

Biology · Cell Structure & Function · Biology · Organelles

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

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Questions

  1. 1.

    According to the endosymbiotic theory, primary chloroplasts originated through the engulfment of which ancestral organism by an early eukaryotic cell?

    • A) An oxygenic photosynthetic prokaryote closely related to cyanobacteria
    • B) An aerobic heterotrophic prokaryote closely related to alpha-proteobacteria
    • C) An anaerobic methanogenic archaeon lacking internal membrane systems
    • D) A photosynthetic eukaryotic alga surrounded by a peptidoglycan wall
  2. 2.

    During active photosynthesis in a plant cell, light-driven electron transport leads to an accumulation of protons within the chloroplast. In which sub-compartment of the chloroplast does this accumulation result in the highest proton concentration and lowest pH?

    • A) Stroma
    • B) Thylakoid lumen
    • C) Intermembrane space
    • D) Outer membrane
  3. 3.

    Which feature distinguishes chloroplasts from other types of plastids, such as chromoplasts and leucoplasts, found in plant cells?

    • A) The possession of a double-membrane envelope surrounding the organelle
    • B) The presence of circular DNA and prokaryotic-like ribosomes
    • C) The presence of an extensive thylakoid membrane system containing chlorophyll
    • D) The ability to divide independently within the cytoplasm by binary fission
  4. 4.

    Which of the following features enables chloroplasts to synthesize some of their own proteins independently of the cell's nuclear genome?

    • A) Linear chromosomes bound by histone proteins within the thylakoid lumen
    • B) Phospholipid monolayers forming the outer boundary of the organelle envelope
    • C) Microtubule transport networks anchored along the intermembrane space
    • D) Circular DNA molecules and 70S ribosomes suspended within the stroma
  5. 5.

    Which of the following correctly matches a structural component of a chloroplast with the photosynthetic process that occurs within it?

    • A) Grana – synthesis of glucose during the Calvin cycle
    • B) Thylakoid membrane – absorption of light energy by chlorophyll during the light-dependent reactions
    • C) Stroma – splitting of water molecules by photolysis
    • D) Outer membrane – synthesis of ATP via chemiosmosis

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