Dictionary > Uniport

Uniport

Definition
noun
The transport of molecule or ion across a membrane through facilitated diffusion without coupling to the transport of another molecule or ion (as opposed to symport and antiport)
Supplement
In biological systems, molecules and ions move across the plasma membrane out and into the cell. When there is a net movement of molecules from higher to lower concentration, it is referred to as diffusion. It does not require energy unlike in active transport of molecules and ions. Diffusion may be simple or facilitated. A facilitated diffusion requires a protein in the plasma membrane. A transmembrane or a carrier protein assists in the transport of molecules or ions based on the concentration gradient. Facilitated diffusion may occur differently depending on the coupling mechanisms. It may be through symport or antiport. In symport and antiport, the molecule is transported across the plasma membrane by coupling to the transport of another molecule. The difference in the two mechanisms lies on the direction of the transport. In symport, two different molecules move in the same direction whereas in antiport, in different directions. A uniport is the transport of only one molecule, without coupling to the transport of another molecule or ion. In uniport, the transport process makes use of a uniporter (i.e. an integral membrane protein, such as ion channel or carrier protein). The uniporter binds to one molecule at a time and transporting it with its concentration gradient.
Compare:

See also:

  • facilitated diffusion


  • You will also like...

    An artistic depiction of Dunkleosteus fish
    Fish

    The sea was teeming with life. Eventually, through reproduction and continued variation, fish came about. There are over..

    Ecological Research Measuring & Analysis
    Ecological Research: Measuring & Analysis

    This lesson is about the methods used for ecological research, such as quadrat and transect sampling, canopy fogging, an..

    river
    Running Water Freshwater Communities

    This tutorial introduces flowing water communities, which bring new and dithering factors into the equation for possible..

    Schematic diagram of bacterial lactose operon
    Gene Action – Operon Hypothesis

    Learn how the way genes control and determine every aspect of the body. This lesson uses lac operon as an example. ..

    ..

    mRNA
    Protein Synthesis

    Part of the genetic information is devoted to the synthesis of proteins. mRNA, a type of RNA, is produced as a transcri..

    Adaptation Tutorial
    Adaptation Tutorial

    Adaptation, in biology and ecology, refers to the process or trait through which organisms or the populations in a habit..

    Related Articles...

    No related articles found

    See all Related Topics