Textbook Question
A substance moving across a membrane against a concentration gradient is moving by .a. passive transport;b. osmosis;c. facilitated diffusion;d. active transport;e. diffusion
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2. Cell Chemistry & Cell Components
Concentration Gradients and Diffusion
Multiple Choice
Which of the following statements about diffusion is true?
A
It's a process where water moves across a semi-permeable membrane to a region of high solute concentration.
B
It requires an expenditure of energy by the cell.
C
It's a process where molecules move from a region of lower concentration to a region of higher concentration.
D
It's a process where molecules move from a region of higher concentration to a region of lower concentration.
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.
Differentiate diffusion from osmosis: Osmosis specifically refers to the movement of water across a semi-permeable membrane, whereas diffusion involves the movement of solute molecules.
Recognize that diffusion is a passive process: It does not require energy expenditure by the cell, as it relies on the natural kinetic energy of molecules.
Identify the direction of molecular movement in diffusion: Molecules move down their concentration gradient, from higher to lower concentration, until equilibrium is reached.
Evaluate the given statements: Compare each statement with the definition and characteristics of diffusion to determine which one accurately describes the process.
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