Multiple Choice
Which of the following best describes facilitated diffusion?
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6. The Membrane
Concentration Gradients and Diffusion
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Which of the following correctly completes the statement: The three main factors that affect diffusion are concentration, temperature, and ____?
A
light intensity
B
pH
C
molecular size
D
enzyme activity
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, until equilibrium is reached.
Identify the factors that influence diffusion: The rate of diffusion is affected by three main factors: concentration gradient, temperature, and molecular size. These factors determine how quickly or slowly molecules move across a medium.
Explain why molecular size is relevant: Larger molecules move more slowly because they encounter more resistance as they pass through a medium, while smaller molecules diffuse more quickly due to their lower resistance.
Eliminate incorrect options: Light intensity and enzyme activity are not directly related to diffusion. pH can affect diffusion in specific cases (e.g., ionized molecules), but it is not a primary factor in general diffusion processes.
Conclude that molecular size is the correct answer: Among the given options, molecular size is the third main factor that affects diffusion, alongside concentration and temperature.
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