Multiple Choice
Which of the following are the primary products of the light-dependent reactions of photosynthesis?
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3. Acids and Bases
Organic Chemistry Reactions
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Which of the following reactions is characteristic of facilitated diffusion in organic chemistry?
A
Direct passage of molecules through the lipid bilayer
B
Involvement of carrier proteins and energy expenditure
C
Transport of molecules through a membrane without energy input
D
Movement of molecules against the concentration gradient
Verified step by step guidance1
Facilitated diffusion is a type of passive transport, which means it does not require energy input from the cell.
In facilitated diffusion, molecules move across a cell membrane through protein channels or carriers, but only down their concentration gradient.
Unlike active transport, facilitated diffusion does not involve the movement of molecules against the concentration gradient, nor does it require energy expenditure.
The direct passage of molecules through the lipid bilayer is characteristic of simple diffusion, not facilitated diffusion.
Therefore, the characteristic feature of facilitated diffusion is the transport of molecules through a membrane without energy input, using carrier proteins or channels.
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