Unit 1: Unity and Diversity
Topic 1.4: Cell Structure Questions
Practice 20 exam-style questions for IB Biology Topic 1.4. Review the question stems below, then unlock the full Question Bank to access markschemes, model answers, and AI grading.
1Identify1 mark
A motile bacterium swims through pond water.
Which structure carries out this movement?
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A single-celled Euglena swims towards a region of brighter light in the pond water.
Which function of life does this behaviour show?
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Which organelle is found in all prokaryotic cells AND all eukaryotic cells?
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A fungal cell has a rigid outer wall.
What is the main component of a fungal cell wall?
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Unlock Question5Deduce1 mark
A Paramecium is observed with several food vacuoles, each containing ingested algae that are being digested.
Which function of life is the Paramecium carrying out?
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Which statement is one of the three points of cell theory?
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An electron micrograph of a eukaryotic cell shows a clear nucleus, a straight rigid outer wall, and several green oval structures inside.
What type of cell is shown?
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What is the main function of the plasma membrane, a structure common to all cells?
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Which structure is present in a typical eukaryotic cell but absent from every prokaryotic cell?
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Unlock Question10Distinguish2 marks
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Distinguish between the magnification and the resolution of a microscope.
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A swimming bacterium has flagella and many ribosomes.
State the function of (a) the flagella and (b) the ribosomes.
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Outline one structural difference between a prokaryotic cell and a eukaryotic cell.
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Four students each name a structure they think is present in a typical animal cell.
Which structure IS found in an animal cell?
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In cell biology, what does the term 'ultrastructure' refer to?
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Which list gives ONLY structures that are present in every living cell?
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Define the term excretion.
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A microscope can resolve structures as small as a ribosome inside a cell.
What does this microscope most likely use to form its image?
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A student magnifies a blurry photo of a cell on a screen until it fills the wall, but no new structures become visible.
Which property of the original image limited what the student could see?
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Animal cells, plant cells and fungal cells are placed in the same broad category because of one shared feature.
Which feature do all three share?
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Inside a single cell, glucose is broken down to release energy that powers the cell's activities.
Which function of life is this?
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