Unit 2: Form and Function
Topic 2.3: Membranes and Transport Questions
Practice 20 exam-style questions for IB Biology Topic 2.3. Review the question stems below, then unlock the full Question Bank to access markschemes, model answers, and AI grading.
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State the name of the bulk-transport process in which the plasma membrane folds inwards to bring large material into the cell.
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Which type of molecule is UNABLE to cross the phospholipid bilayer directly and must instead be moved by bulk transport?
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State the name given to a membrane protein that uses ATP to move particles against their concentration gradient.
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On a labelled fluid mosaic diagram, which region of the membrane is hydrophilic?
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What is the basic structure of a cell membrane?
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Why must ions and large polar molecules cross a membrane by facilitated diffusion rather than passing straight through the bilayer?
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A glucose molecule moves from a region of high glucose concentration to a region of low glucose concentration through a membrane protein.
No ATP is used.
What is this process?
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A membrane component carries a carbohydrate chain on the outer surface and acts as an identity tag for the cell.
Which component is it?
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State whether facilitated diffusion uses the cell's energy (ATP), and explain your answer in one phrase.
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State the name of the membrane component that carries a carbohydrate chain on the outer surface and is responsible for cell recognition.
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A cell is placed in a solution and its mass steadily decreases over the next four minutes.
State the net direction of water movement across the plasma membrane.
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Which protein uses energy from ATP to move particles against their concentration gradient?
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Which molecule crosses the plasma membrane most easily by simple diffusion, passing straight through the phospholipid bilayer?
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In simple diffusion and osmosis, which way do particles move on their own, and what does this require from the cell?
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Simple diffusion and facilitated diffusion are compared.
Which feature is shared by BOTH?
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A table shows that potassium is far more concentrated inside a cell than outside.
How is this difference maintained?
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In osmosis, in which direction does water move across a partially permeable membrane?
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Which row correctly contrasts passive transport with active transport?
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In a dialysis-tubing experiment that models digestion, what does the tubing itself represent in the body?
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Which three processes correctly classify ways that molecules cross the phospholipid bilayer?
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