When a substance must attach to another molecule, called a carrier, to move into or out of a cell, it is called what?
A) Active transport
B) Osmosis
C) Passive transport
D) Facilitated diffusion
D
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Sometimes a substance cannot move freely on its own in or out of a cell. Such a substance may attach to another kind of molecule, called a carrier, to be diffused. This form of diffusion, known as facilitated diffusion, does not require energy, only the presence of the carrier. Active transport requires energy to move the substance against the concentration gradient. Osmosis is a special form of diffusion where water moves across a semipermeable membrane from an area low in solutes to one that is higher in solutes to dilute solutes. Passive transport does not require energy to move solutions across a semipermeable membrane and includes diffusion, osmosis, and facilitated diffusion.
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