Multiple Choice
Exchange of gases and nutrients occurs by diffusion between the __________.
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6. The Membrane
Concentration Gradients and Diffusion
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Which of the following best describes a concentration gradient?
A
A difference in the concentration of a substance between two regions.
B
The process by which cells use energy to transport substances.
C
The movement of water molecules across a semipermeable membrane.
D
A uniform distribution of molecules throughout a solution.
Verified step by step guidance1
Understand the term 'concentration gradient': A concentration gradient refers to a difference in the concentration of a substance between two regions, such as across a cell membrane or within a solution.
Analyze the options provided: Look for the one that aligns with the definition of a concentration gradient. Eliminate options that describe other processes, such as active transport or osmosis.
Option 1: 'A difference in the concentration of a substance between two regions' matches the definition of a concentration gradient. Keep this as a potential correct answer.
Option 2: 'The process by which cells use energy to transport substances' describes active transport, not a concentration gradient. Eliminate this option.
Option 3: 'The movement of water molecules across a semipermeable membrane' describes osmosis, and Option 4: 'A uniform distribution of molecules throughout a solution' describes equilibrium, not a gradient. Eliminate these options as well.
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