Multiple Choice
Which of the following best describes a concentration gradient?
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6. The Membrane
Concentration Gradients and Diffusion
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Diffusion rate is fastest when the concentration gradient is:
A
steep
B
absent
C
shallow
D
uniform
Verified step by step guidance1
Understand the concept of diffusion: Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration, driven by the concentration gradient.
Define concentration gradient: The concentration gradient refers to the difference in concentration of a substance between two regions. A steep gradient means a large difference, while a shallow gradient means a small difference.
Relate diffusion rate to the concentration gradient: The rate of diffusion is directly proportional to the steepness of the concentration gradient. A steeper gradient results in faster diffusion because molecules move more rapidly to equalize the concentration.
Analyze the options: 'Steep' indicates a large difference in concentration, which accelerates diffusion. 'Absent' means no gradient, so diffusion cannot occur. 'Shallow' indicates a small difference, leading to slower diffusion. 'Uniform' means equal concentration, so no diffusion occurs.
Conclude that the fastest diffusion rate occurs when the concentration gradient is steep, as this provides the greatest driving force for molecular movement.
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