Multiple Choice
Which process moves an ion across a cell membrane against the concentration gradient?
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6. The Membrane
Active Transport
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Which of the following is an example of active transport through a cell membrane?
A
Simple diffusion
B
Facilitated diffusion
C
Sodium-potassium pump
D
Osmosis
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 options given: Simple diffusion, facilitated diffusion, sodium-potassium pump, and osmosis.
Differentiate between passive and active transport: Passive transport (simple diffusion, facilitated diffusion, and osmosis) does not require energy, while active transport (like the sodium-potassium pump) requires energy.
Examine the sodium-potassium pump: This is a type of active transport where sodium ions (Na+) are pumped out of the cell and potassium ions (K+) are pumped into the cell against their concentration gradients, using ATP.
Conclude that the sodium-potassium pump is the correct example of active transport, as it involves the use of energy to move ions against their concentration gradients.
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