Multiple Choice
Which of the following correctly describes a general property of all electrogenic pumps?
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6. The Membrane
Active Transport
Multiple Choice
Which of the following is an example of active transport?
A
Facilitated diffusion of glucose
B
Osmosis of water
C
Diffusion of oxygen
D
Sodium-potassium pump
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, against the concentration gradient. This process requires energy, usually in the form of ATP.
Identify the key characteristics of active transport: It involves the use of transport proteins and energy to move substances against their concentration gradient.
Examine the options provided: Facilitated diffusion, osmosis, and diffusion are all passive transport processes that 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, both against their concentration gradients.
Conclude why 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, unlike the other options which are passive transport processes.
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