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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The three main factors that affect the rate of diffusion are concentration, temperature, and which of the following?
A
pH
B
Light intensity
C
Atmospheric pressure
D
Molecular size
Verified step by step guidance1
Step 1: Begin by understanding 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.
Step 2: Recall the factors that influence the rate of diffusion. These include concentration gradient, temperature, and molecular size. Molecular size affects diffusion because smaller molecules move more easily through a medium compared to larger molecules.
Step 3: Analyze why molecular size is relevant. Larger molecules encounter more resistance and move slower, while smaller molecules diffuse faster due to their ability to navigate through spaces in the medium more efficiently.
Step 4: Eliminate the incorrect options. pH, light intensity, and atmospheric pressure are not primary factors affecting diffusion. While they may influence other biological processes, they do not directly impact the rate of diffusion in the same way molecular size does.
Step 5: Conclude that molecular size is the correct answer because it directly impacts the speed at which molecules can move through a medium during diffusion.
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