Scelta multipla
Which statement best describes a passive transport process across a cell membrane?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Scelta multipla
In many freshwater protists, which organelle helps prevent the cell from swelling and bursting by collecting and pumping excess water out of the cell?
A
Lysosome
B
Golgi apparatus
C
Contractile vacuole
D
Central vacuole
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Understand the problem: The question asks which organelle in freshwater protists prevents the cell from swelling and bursting by removing excess water.
Recall the function of each organelle listed: Lysosomes digest cellular waste, Golgi apparatus modifies and packages proteins, central vacuole stores substances mainly in plant cells.
Focus on the unique challenge freshwater protists face: they live in hypotonic environments where water tends to enter the cell by osmosis.
Identify the organelle specialized for expelling excess water to maintain osmotic balance, which is the contractile vacuole.
Conclude that the contractile vacuole collects excess water and pumps it out, preventing the cell from bursting.
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