Question

Define Uniport, Symport and Antiport. Do they require energy?

Answer 1

Introduction

Transport of substances that takes place with the help of integral proteins is called facilitated diffusion. There are three types of facilitated diffusion

* Uniport

* Symport

* Antiport

Uniport

When the movement of a single molecule takes place, through the carrier protein, without coupling with another molecule, the process is called uniport transport.

Antiport

The type of transport that takes place through the carrier proteins, in which two types of molecules have to move together but in opposite directions is called antiport transport.

Symport

The type of transport that takes place through the carrier proteins, in which two types of molecules have to move together in the same direction is called symport transport.



Energy requirement

These all are types facilitated diffusion. Facilitated diffusion is the movement of molecules or ions across a biological membrane with the help of carrier proteins without involving the expenditure of energy. So they do not require energy.