Multiple Choice
Which homeostatic process is characterized by the diffusion of only water molecules across a selectively permeable membrane?
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6. The Membrane
Osmosis
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Which of the following best describes the main difference between osmosis and diffusion?
A
Osmosis involves the movement of solute molecules, while diffusion involves the movement of water molecules only.
B
Osmosis requires energy input from the cell, whereas diffusion does not.
C
Diffusion only occurs in living cells, while osmosis can occur in both living and non-living systems.
D
Osmosis is the movement of water molecules across a selectively permeable membrane, while diffusion is the movement of any type of molecules from an area of higher concentration to an area of lower concentration.
Verified step by step guidance1
Understand the definitions of osmosis and diffusion: Osmosis refers specifically to the movement of water molecules across a selectively permeable membrane, while diffusion is the general movement of molecules (not limited to water) from an area of higher concentration to an area of lower concentration.
Recognize the key difference: Osmosis requires a selectively permeable membrane to allow only water molecules to pass through, whereas diffusion does not require a membrane and can involve any type of molecules.
Consider the energy requirement: Neither osmosis nor diffusion requires energy input from the cell; both are passive transport processes driven by concentration gradients.
Clarify the scope of occurrence: Diffusion can occur in both living and non-living systems, as can osmosis, provided the conditions (e.g., presence of a selectively permeable membrane for osmosis) are met.
Conclude with the correct answer: Osmosis is the movement of water molecules across a selectively permeable membrane, while diffusion is the movement of any type of molecules from an area of higher concentration to an area of lower concentration.
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