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

Easy

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.

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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