Which of the following criteria does not pert | vedclass

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(B) The correct answer is $B$. Facilitated transport (or facilitated diffusion) is the spontaneous movement of molecules or ions across a biological m

Vedclass · Accepted Answer

Uphill transport

Vedclass · Answer

(B) The correct answer is $B$. Facilitated transport (or facilitated diffusion) is the spontaneous movement of molecules or ions across a biological membrane through specific transmembrane integral proteins. It is a passive process,meaning it does not require energy $(ATP)$. Facilitated diffusion is mediated by protein channels and carrier proteins. Most transport proteins involved in this process are highly selective and only transport specific molecules. Since it is a passive process,molecules move down their concentration gradient,which is known as 'downhill transport'. 'Uphill transport' refers to active transport,where molecules move against their concentration gradient,requiring energy. Therefore,uphill transport is not a characteristic of facilitated transport.

$S.no.$	Property	Facilitated diffusion	Active Transport	Simple Diffusion
$I.$	Highly specific	Yes	Yes	No
$II.$	Energy as $ATP$	No	Yes	No
$III.$	Saturation point reached when all carrier proteins are used	Yes	Yes	No
$IV.$	Require transport proteins	Yes	Yes	No

Which of the following criteria does not pertain to facilitated transport?

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