Multiple Choice
Which of the following is not a characteristic of active transport?
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6. The Membrane
Active Transport
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Which of the following describes an aspect of active transport?
A
Diffusion of molecules through a semipermeable membrane
B
Movement of molecules against their concentration gradient
C
Facilitated diffusion using channel proteins
D
Osmosis of water molecules
Verified step by step guidance1
Understand that active transport is a process that requires energy to move molecules across a cell membrane.
Recognize that active transport moves molecules against their concentration gradient, from an area of lower concentration to an area of higher concentration.
Identify that this process is different from passive transport methods like diffusion and osmosis, which do not require energy and move molecules along their concentration gradient.
Note that facilitated diffusion, while involving proteins, is still a passive process and does not require energy, unlike active transport.
Conclude that the correct description of active transport is the movement of molecules against their concentration gradient, which requires energy input, often in the form of ATP.
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