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(B) Facilitated diffusion is a type of passive transport where molecules move across the membrane along the concentration gradient (from a region of h

Vedclass · Accepted Answer

Uphill transport

Vedclass · Answer

(B) Facilitated diffusion is a type of passive transport where molecules move across the membrane along the concentration gradient (from a region of higher concentration to a region of lower concentration). Since it follows the concentration gradient,it is a 'downhill' process and does not require metabolic energy $(ATP)$. It requires specific membrane proteins (carrier or channel proteins) to facilitate the movement of hydrophilic molecules. It is also highly selective in nature. Therefore,'Uphill transport' is the incorrect characteristic,as it describes active 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

Facilitated diffusion is characterized by all,except

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