Multiple Choice
Why is active transport an important process in cells?
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6. The Membrane
Active Transport
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Which of the following is an example of an active transport process?
A
Diffusion of oxygen across a cell membrane
B
Sodium-potassium pump
C
Osmosis of water
D
Facilitated diffusion of glucose
Verified step by step guidance1
Understand the concept of active transport: Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, using energy in the form of ATP.
Identify the processes listed: Diffusion, osmosis, facilitated diffusion, and the sodium-potassium pump.
Differentiate between passive and active transport: Passive transport (diffusion, osmosis, facilitated diffusion) does not require energy, while active transport (like the sodium-potassium pump) requires energy.
Analyze the sodium-potassium pump: This process moves sodium (Na+) and potassium (K+) ions across the cell membrane against their concentration gradients, using ATP.
Conclude that the sodium-potassium pump is an example of active transport because it requires energy to move ions against their concentration gradients.
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