devarshi-dt-logo

Question:

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

Requirement of special membrane proteins

High selectivity

Transport saturation

Uphill transport

Solution:

Facilitated transport is the process of spontaneous passive transport or downhill transport of molecules or ions across a biological membrane via specific transmembrane integral proteins. The movement of molecules or ions is from a region of higher concentration to a region of lower concentration. Uphill transport, on the other hand, requires energy and moves molecules against their concentration gradient. Thus, the correct answer is option (D), 'Uphill transport'.