Multiple Choice
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?
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6. The Membrane
Osmosis
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Which term best describes the movement of water across a semipermeable membrane from an area of low solute concentration to an area of high solute concentration?
A
Osmosis
B
Facilitated diffusion
C
Diffusion
D
Active transport
Verified step by step guidance1
Understand the concept of osmosis: Osmosis is the movement of water molecules across a semipermeable membrane from an area of low solute concentration to an area of high solute concentration. This process occurs to balance solute concentrations on both sides of the membrane.
Differentiate osmosis from other transport mechanisms: Facilitated diffusion involves the movement of molecules (not water) across a membrane with the help of transport proteins, while diffusion refers to the movement of molecules from high to low concentration without a membrane. Active transport requires energy to move molecules against their concentration gradient.
Identify the key feature of the problem: The question specifically mentions water movement across a semipermeable membrane, which is a defining characteristic of osmosis.
Eliminate incorrect options: Facilitated diffusion, diffusion, and active transport do not describe the movement of water across a semipermeable membrane from low to high solute concentration.
Conclude that the correct term describing this process is 'Osmosis,' based on the definition and distinguishing features provided.
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