Multiple Choice
Which of the following molecules provides the energy required for active transport processes in cells?
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6. The Membrane
Active Transport
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Which of the following is an example of active transport?
A
Osmosis
B
Sodium-potassium pump
C
Simple diffusion
D
Facilitated diffusion
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 options given: Osmosis, Sodium-potassium pump, Simple diffusion, and Facilitated diffusion.
Evaluate each option: Osmosis is the passive movement of water molecules across a membrane. Simple diffusion is the passive movement of molecules from high to low concentration. Facilitated diffusion is also passive, using transport proteins to move molecules down their concentration gradient.
Focus on the Sodium-potassium pump: This is a well-known example of active transport. It moves sodium ions out of the cell and potassium ions into the cell, against their concentration gradients, using energy from ATP.
Conclude that the Sodium-potassium pump is the correct example of active transport among the given options, as it requires energy to move ions against their concentration gradients.
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