Multiple Choice
The active uptake of ions into root cells results in which of the following?
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6. The Membrane
Introduction to Membrane Transport
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Which of the following best describes the process of facilitated diffusion across a cell membrane?
A
Movement of water molecules through the lipid bilayer without any proteins
B
Movement of molecules from high to low concentration through a protein channel without energy input
C
Movement of molecules from low to high concentration using ATP
D
Engulfing of large particles by the cell membrane to form vesicles
Verified step by step guidance1
Facilitated diffusion is a type of passive transport, meaning it does not require energy input from the cell. Begin by understanding that this process moves molecules down their concentration gradient, from an area of high concentration to an area of low concentration.
Recognize that facilitated diffusion involves the use of specific protein channels or carriers embedded in the cell membrane. These proteins help transport molecules that cannot easily pass through the lipid bilayer, such as ions or polar molecules.
Eliminate options that involve energy input, such as ATP usage, because facilitated diffusion is passive and does not require energy.
Eliminate options that describe processes unrelated to facilitated diffusion, such as the movement of water molecules through the lipid bilayer (osmosis) or the engulfing of large particles by the cell membrane (endocytosis).
Select the option that accurately describes facilitated diffusion: 'Movement of molecules from high to low concentration through a protein channel without energy input.' This aligns with the definition and mechanism of facilitated diffusion.
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