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Q.

Which of the following is correct about facilitated and active transport?

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a

Both require expenditure of energy to transport substances across the membrane.

b

Both transport substances from their lower to higher concentration across the membrane.

c

Both use phospholipid channels to move the molecules across the membrane.

d

Both need carrier proteins to transport the substances.

answer is D.

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Detailed Solution

In facilitated diffusion special proteins help move substances across membranes without expenditure of ATP energy. Facilitated diffusion cannot cause net transport of molecules from a region of low concentration to a region of higher concentration – this would require input of energy.

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