In which method of transport in the plasma me | vedclass

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(C) Simple diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration without the expenditure of

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Simple diffusion

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(C) Simple diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration without the expenditure of energy.This process does not require any membrane proteins or carrier molecules to facilitate the movement of substances across the plasma membrane.In contrast,active transport,facilitated diffusion,and the $Na^+ -K^+$ pump all require specific membrane proteins or carrier molecules to transport substances across the membrane.

Property	Simple Diffusion	Facilitated Transport	Active Transport
Requires special membrane proteins	No	$a$	Yes
Transport saturates	No	Yes	$b$
Uphill transport	$c$	No	Yes
Requires $ATP$ energy	No	No	$d$

In which method of transport in the plasma membrane is a carrier molecule not required?

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