Facilitated transport differs from diffusion in that...

Facilitated transport differs from diffusion in that facilitated diffusion
a. involves the passive use of a carrier protein.
b. involves the active use of a carrier protein.
c. moves a molecule from a low to a high concentration.
d. involves the use of ATP molecules.

Key Concepts

Passive Transport

Passive transport refers to the movement of substances across a cell membrane without the use of additional energy from the cell. It occurs naturally along concentration gradients, allowing molecules, including those transported by facilitated diffusion, to move from regions of high concentration to regions of low concentration.

Concentration Gradient

A concentration gradient is the difference in the concentration of a substance between two regions. It is the driving force behind passive transport processes such as simple diffusion and facilitated diffusion, as molecules inherently move toward areas where their concentration is lower, promoting equilibrium in the system.

Facilitated Diffusion

Facilitated diffusion is a type of passive transport in which molecules cross the cell membrane with the help of a carrier or channel protein. Unlike simple diffusion, this process increases the rate at which substances are transported by providing specific pathways, yet it still relies on the natural movement of molecules down their concentration gradient without any energy input.

Carrier Proteins

Carrier proteins are specialized membrane proteins that bind to specific molecules and undergo conformational changes to aid in their transport across the cell membrane. In the context of facilitated diffusion, these proteins enable the selective and efficient movement of molecules from an area of higher concentration to an area of lower concentration without consuming cellular energy.

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