Multiple Choice
Which statement about active transport is most accurate?
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6. The Membrane
Active Transport
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Which type of particle movement across a cell membrane requires the input of energy?
A
Osmosis
B
Facilitated diffusion
C
Simple diffusion
D
Active transport
Verified step by step guidance1
Understand the concept of particle movement across a cell membrane: Molecules can move across the cell membrane through different mechanisms, including passive transport (which does not require energy) and active transport (which requires energy).
Review passive transport mechanisms: Osmosis, facilitated diffusion, and simple diffusion are all examples of passive transport. These processes rely on the concentration gradient and do not require energy input from the cell.
Define active transport: Active transport is the movement of particles against their concentration gradient (from low concentration to high concentration). This process requires energy, typically in the form of ATP (adenosine triphosphate).
Identify the key difference: The defining characteristic of active transport is the requirement for energy input, whereas osmosis, facilitated diffusion, and simple diffusion occur passively without energy.
Conclude that the correct answer is active transport, as it is the only type of particle movement across a cell membrane that requires the input of energy.
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