Multiple Choice
Diffusion rate is fastest when the concentration gradient is:
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6. The Membrane
Concentration Gradients and Diffusion
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Which of the following statements about diffusion is true?
A
It's a process where water moves across a semi-permeable membrane to a region of high solute concentration.
B
It requires an expenditure of energy by the cell.
C
It's a process where molecules move from a region of lower concentration to a region of higher concentration.
D
It's a process where molecules move from a region of higher concentration to a region of lower concentration.
Verified step by step guidance1
Begin by understanding the concept of diffusion. Diffusion is a passive transport process where molecules move from an area of higher concentration to an area of lower concentration, driven by the concentration gradient.
Identify the key characteristics of diffusion: it does not require energy input from the cell, and it occurs due to the random movement of molecules.
Examine each statement provided in the problem. The first statement describes osmosis, which is the movement of water across a semi-permeable membrane, not diffusion.
The second statement incorrectly suggests that diffusion requires energy expenditure, which is not true as diffusion is a passive process.
The third statement incorrectly describes diffusion as moving molecules from lower to higher concentration, which contradicts the definition of diffusion. The correct statement is the fourth one, which accurately describes diffusion as the movement of molecules from a region of higher concentration to a region of lower concentration.
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