Multiple Choice
Which of the following does NOT affect the rate of diffusion across a membrane?
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6. The Membrane
Concentration Gradients and Diffusion
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What is a concentration gradient in the context of diffusion?
A
The process of particles moving randomly in a solution
B
A difference in the concentration of a substance across a space
C
The equilibrium state where concentrations are equal
D
The movement of particles from low to high concentration
Verified step by step guidance1
Understand that diffusion is the movement of particles from an area of higher concentration to an area of lower concentration, driven by the concentration gradient.
Recognize that a concentration gradient refers to the difference in the concentration of a substance between two areas.
Visualize the concentration gradient as a slope or gradient where particles naturally move down the slope from high to low concentration.
Identify that the process of diffusion continues until equilibrium is reached, where the concentration of particles is equal throughout the space.
Note that the movement of particles from low to high concentration is not typical of diffusion and usually requires energy input, such as in active transport.
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