SCIENCE
CELL BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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movement of particles from [high] to [low]
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a protein “helper”
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movement of particles from [low] to [high]
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energy
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Detailed explanation-1: -Ans)There is a distinction between the two in that in simple diffusion, molecules move without the assistance of membrane proteins, whereas in facilitated diffusion, membrane proteins assist molecules in their movement downward.
Detailed explanation-2: -In simple diffusion, the movement of particles takes place with the direction of the concentration gradient. In facilitated diffusion, the movement of molecules can take place in both ways – along the direction and opposite of the concentration gradient.
Detailed explanation-3: -Both facilitated diffusion and active transport use transmembrane proteins to transport molecules. Facilitated diffusion does not require cellular energy to transport molecules. However, active transport uses ATP or electrochemical potential to transport molecules.
Detailed explanation-4: -Active transport is not the same as facilitated diffusion. Both active transport and facilitated diffusion do use proteins to assist in transport. However, active transport works against the concentration gradient, moving substances from areas of low concentration to areas of high concentration.