Facilitated transport is a type of passive transport that involves the movement of molecules across a cell membrane with the help of specific carrier proteins. It does not require energy expenditure by the cell.

The option that does not pertain to facilitated transport is:

A) Uphill transport

Explanation:

- Uphill transport refers to the movement of molecules against their concentration gradient, from an area of low concentration to an area of high concentration. This process requires energy input from the cell, and is therefore not a feature of facilitated transport.
- The other options, on the other hand, are characteristics of facilitated transport:
- Transport saturation: Facilitated transport can become saturated when all the carrier proteins are occupied, leading to a maximum rate of transport.
- High selectivity: Facilitated transport is highly selective, meaning that only certain molecules can bind to specific carrier proteins.
- Requirement of special membrane: Facilitated transport requires the presence of specific carrier proteins on the cell membrane to facilitate the movement of molecules.

Facilitated transport is a type of passive transport where a substance is transported across the cell membrane with the help of a carrier protein. It does not require the input of energy from the cell.

Explanation:
A) Uphill transport:
Facilitated transport is a type of passive transport that moves substances from an area of high concentration to an area of low concentration. It does not require energy input from the cell. Uphill transport, on the other hand, moves substances from an area of low concentration to an area of high concentration, which requires energy input from the cell. Therefore, facilitated transport does not pertain to uphill transport.

B) Transport saturation:
Facilitated transport can become saturated if all of the carrier proteins are occupied with the substance being transported. Once the carrier proteins are saturated, the rate of transport no longer increases, even if the concentration gradient is increased. This is known as transport saturation.

C) High selectivity:
Facilitated transport is highly selective and only allows certain substances to pass through the membrane. This is because the carrier proteins have specific binding sites that only recognize and transport certain molecules.

D) Requirement of special membrane:
Facilitated transport does not require a special membrane. It occurs across the cell membrane, which is composed of a phospholipid bilayer and various types of proteins.

In conclusion, the correct answer is option A, as uphill transport does not pertain to facilitated transport.