Multiple Choice
Which of the following membrane activities requires energy from ATP hydrolysis?
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6. The Membrane
Active Transport
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Which of the following is a form of active transport?
A
Facilitated diffusion
B
Simple 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 key characteristics of active transport: It requires energy because it moves substances against their concentration gradient, unlike passive transport methods such as diffusion and osmosis.
Examine the options provided: Facilitated diffusion, simple diffusion, and osmosis are all forms of passive transport, which do not require energy and move substances along their concentration gradient.
Focus on the sodium-potassium pump: This is a classic example of active transport. It uses ATP to move sodium ions out of the cell and potassium ions into the cell, against their respective concentration gradients.
Conclude that the sodium-potassium pump is the correct answer: It fits the definition of active transport because it requires energy to move ions against their concentration gradient.
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