Multiple Choice
A cell that neither gains nor loses water while sitting in a solution is probably sitting in:
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6. The Membrane
Osmosis
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Which process describes the movement of water molecules across a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration?
A
Osmosis
B
Diffusion
C
Facilitated diffusion
D
Active transport
Verified step by step guidance1
Understand the key terms in the problem: 'selectively permeable membrane' refers to a membrane that allows certain molecules to pass through while blocking others, and 'solute concentration' refers to the amount of dissolved substances in a solution.
Recognize that the movement of water molecules across a membrane is a specific type of transport process. Water moves to balance solute concentrations on either side of the membrane.
Recall that osmosis is the process where water molecules move from an area of low solute concentration (high water concentration) to an area of high solute concentration (low water concentration) through a selectively permeable membrane.
Differentiate osmosis from other processes: diffusion involves the movement of solutes, facilitated diffusion requires transport proteins for solutes, and active transport requires energy to move solutes against their concentration gradient.
Conclude that the process described in the problem is osmosis, as it specifically involves the movement of water molecules across a selectively permeable membrane to balance solute concentrations.
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