THE CELL
TRANSPORT INTO AND OUT OF THE CELL
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What process do ion channel use to move ions across the cell membrane?
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pumping
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respiration
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passive transport
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active transport
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Explanation:
Detailed explanation-1: -Channel proteins span the membrane and make hydrophilic tunnels across it, allowing their target molecules to pass through by diffusion.
Detailed explanation-2: -Ion channels can filter ions, but the flow of ions is passive.
Detailed explanation-3: -Explanation: if transport through ion channel is done down concentration gradient (high to low concentration) then it is facilitated diffusion, and if it is done up concentration gradient (low to high concentration), then it is active transport which requires ATP.
Detailed explanation-4: -The four main kinds of passive transport are simple diffusion, facilitated diffusion, filtration, and/or osmosis.
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