Lesson 3.1.2

3.1.2 Eukaryotic ultrastructure and electron micrographs Quiz: Pearson Edexcel Biology A (Salters-Nuffield), Unit 3

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.1.2, Eukaryotic ultrastructure and electron micrographs: 20 multiple choice questions for the Pearson Edexcel Biology A (Salters-Nuffield) (9BI0), Unit 3: Voice of the Genome, written with Revision Ninja.

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The 20 questions

  1. Which organelle has a double membrane with inner folds called cristae?

    • Mitochondrion
    • Centriole
    • Golgi apparatus
    • Lysosome

  2. Which organelle contains digestive enzymes and breaks down worn-out organelles?

    • Centriole
    • Lysosome
    • Ribosome
    • Nucleolus

  3. In which cells are centrioles found?

    • Plant cells only
    • Prokaryotic cells only
    • All cells, including bacteria
    • Animal cells, and not in most plant cells

  4. Which structure within the nucleus makes ribosomal RNA and assembles ribosome subunits?

    • Nuclear pore
    • Nucleolus
    • Nuclear envelope
    • Chromatin

  5. What do the nuclear pores in the nuclear envelope allow?

    • Movement of lysosomes into the nucleus for digestion
    • Passage of mRNA and proteins between the nucleus and cytoplasm
    • Passage of whole chromosomes out of the cell
    • Passage of entire cell walls into the nucleus

  6. Which organelle is the site of protein synthesis on the rough endoplasmic reticulum?

    • Microtubule
    • Ribosome
    • Vacuole
    • Centriole

  7. Which organelle is present in animal cells but usually absent from plant cells?

    • Centriole
    • Golgi apparatus
    • Mitochondrion
    • Nucleus

  8. An electron micrograph shows a mitochondrion 6 cm long at a magnification of x20,000. What is its actual length?

    • 3 um
    • 0.3 um
    • 30 um
    • 0.03 um

  9. A cell appears 80 mm across in a light micrograph at a magnification of x400. What is its actual diameter?

    • 200 um
    • 32 um
    • 2 mm
    • 20 um

  10. Which structure would be easiest to identify in an electron micrograph of a plant cell but not an animal cell?

    • Cell wall and chloroplasts
    • Mitochondria
    • Ribosomes
    • Centrioles

  11. Why does transmission electron microscopy give higher resolution than light microscopy?

    • Electrons have much shorter wavelengths than visible light
    • Visible light has no wavelength, so it cannot resolve detail
    • Electron microscopy does not require any specimen preparation
    • Electrons can pass through the cell wall of every organism

  12. A structure measures 15 mm in an image and is 0.5 um in reality. What is the magnification?

    • 7,500
    • 3,000
    • 300,000
    • 30,000

  13. Which organelle is the main site of aerobic respiration and ATP production?

    • Lysosome
    • Mitochondrion
    • Nucleolus
    • Golgi apparatus

  14. What is the main role of smooth endoplasmic reticulum?

    • Synthesis of proteins for export from the cell
    • Lipid synthesis and detoxification of substances, with no ribosomes on its surface
    • Replication of chromosomes before mitosis
    • Photosynthesis in plant cells

  15. A student sees cristae in an electron micrograph. Which organelle is being observed?

    • Chloroplast
    • Lysosome
    • Golgi apparatus
    • Mitochondrion

  16. Which organelle contains stacks of membranes called thylakoids?

    • Chloroplast
    • Centriole
    • Mitochondrion
    • Vacuole

  17. What is a likely artefact that can appear in electron micrographs?

    • A nucleus present in a prokaryote
    • A cell membrane visible as a thin outline
    • Ribosomes visible as small dense particles
    • Structures introduced by fixation or staining that may not exist in the living cell

  18. In which organelle does the Krebs cycle take place?

    • Golgi cisternae
    • Nucleolus
    • Mitochondrial matrix
    • Cytoplasm outside the organelles

  19. What is the function of the nucleolus?

    • Digestion of worn-out organelles
    • Storage of glycogen for energy release
    • Control of the cell membrane's permeability
    • Synthesis of ribosomal RNA and assembly of ribosome subunits

  20. Which structure in a eukaryotic cell is a double membrane that encloses the genetic material and has pores?

    • Tonoplast
    • Nuclear envelope
    • Plasma membrane
    • Lysosome membrane

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