Multiple Choice
Which of the following statements about diffusion is true?
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6. The Membrane
Concentration Gradients and Diffusion
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Which cell size is the most efficient at exchanging materials with the environment due to concentration gradients and diffusion?
A
Large cells
B
Cells with irregular shapes
C
Medium cells
D
Small cells
Verified step by step guidance1
Understand that the efficiency of material exchange in cells is largely determined by the surface area-to-volume ratio. Smaller cells have a higher surface area relative to their volume compared to larger cells.
Recognize that a higher surface area-to-volume ratio allows for more efficient diffusion of materials (such as nutrients and waste) across the cell membrane.
Consider the role of concentration gradients in diffusion. A steep concentration gradient can enhance the rate of diffusion, but the surface area-to-volume ratio is a critical factor in determining overall efficiency.
Analyze how cell shape can influence diffusion. Irregular shapes might increase surface area, but small cells inherently have a more favorable surface area-to-volume ratio.
Conclude that small cells are the most efficient at exchanging materials with the environment due to their high surface area-to-volume ratio, which facilitates faster and more efficient diffusion.
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