Multiple Choice
Which of the following is the best definition of osmosis?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
During osmosis in cells, what must water pass through as it moves from an area of lower solute concentration to an area of higher solute concentration?
A
A selectively permeable (semipermeable) membrane
B
A cell wall that blocks all solutes and water
C
A concentration gradient of water only, with no membrane required
D
A cytoskeletal microtubule network that transports water by motor proteins
Verified step by step guidance1
Understand the process of osmosis: Osmosis is the movement of water molecules from an area of lower solute concentration to an area of higher solute concentration.
Recognize that for osmosis to occur in cells, water must move across a barrier that allows selective passage of molecules.
Identify the type of barrier involved: In cells, this barrier is the selectively permeable (or semipermeable) membrane, which permits water to pass but restricts many solutes.
Eliminate incorrect options: A cell wall that blocks all solutes and water would prevent osmosis; a concentration gradient alone is not sufficient without a membrane; cytoskeletal microtubules do not transport water.
Conclude that water moves through the selectively permeable membrane during osmosis, enabling the cell to regulate its internal environment.
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