Active transport is like facilitated diffusion in that both processes facilitate the movement of water through the phospholipids of the plasma membrane move molecules down their concentration gradient require the presence of proteins in the plasma membrane that move molecules from one side of the plasma membrane to the other do not require a source of energy

require the presence of proteins in the plasma membrane that move molecules from one side of the plasma membrane to the other

Explanation:

Both facilitated diffusion and active transport require membrane protein to allow the transport of polar and large molecules from the non-polar core of the membrane.

Facilitated diffusion uses channels or carriers for the purpose. Both channels and carriers are integral membrane proteins. Channels form the specific path to allow the movement while carrier proteins undergo changes in the shape to facilitate the transport.

Active transport also uses the integral membrane proteins to transport otherwise polar and large molecules against their concentration gradient. These are mostly pumps that use the energy of ATP to serve in active transport. Example: Na-K pump

They require the movement of molecules through proteins.

Further Explanation:

The cell membrane can control the flux of ions, amino acids, and gases through a lipid bilayer. The lipid bilayer is made up of phospholipids and these membranes have hydrophobic interior, a layer is selectively permeable and allow only small, non-polar molecule. A large and polar molecule like glucose can’t cross the plasma membrane easily; they require energy and carrier protein to transport. The transport of molecules can either be active or passive transport. In Passive transport, the movement of ions or other molecules across the membrane occurs without any input of the energy.

Types of transport:

Passive transport can be of 3 types:

The process of Diffusion is the movement of a molecule or substance from a higher concentration of an area to a lower concentration area. Mostly Diffusion occurs in gases and liquid. The concentration gradient is referred to as to the difference in the concentration of the substance. The process of Diffusion ceases when the concentration of molecule or substance is equal in both regions.

In passive transport, the movement of ion or small molecule according to their concentration gradient occurs from higher concentration to the lower concentration. But large polar molecule or charged molecule, for example, glucose, Na+ requires carrier protein to transport charged molecule across the membrane, they do not require ATP or energy to transport. In active transport, they require ATP as well as a carrier protein to transport molecules across the plasma membrane; an example of active transport is a sodium-potassium pump.

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Details

Grade: High School

Subject: Biology

Chapter: Cell membrane

Keywords:

Active transport, passive transport, facilitated transport, Diffusion, cell membrane, ions, molecule, glucose.