Answer :
True: Transmembrane proteins move ions or molecules across a membrane against their concentration gradient.
Transmembrane proteins function as gatekeepers by allowing or preventing the entry or exit of the ions or molecules across the cell membrane. The transmembrane proteins can function on both sides of the bilayer membrane and transport solutes across it. The transport of ions or molecules across a membrane against the concentration gradient of the transmembrane proteins is done by active transport.
The transfer of proteins by transmembrane proteins or transporters is performed by two mechanisms: facilitated diffusion or active transport. Facilitated diffusion allows molecules to pass through the membrane without the use of greater energy by simple diffusion. Whereas, active transport uses the energy in the form of ATP and forces the molecules or solutes to pass through the membrane against the concentration gradient.
We can now say that transmembrane proteins move ions or molecules across a membrane against their concentration gradient. This transport is generally aided by a mechanism called active transport.
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