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...

    The Human Physiology
    The Human Physiology

    Physiology is the study of how living organisms function. Thus, human physiology deals specifically with the physiologic..

    Lentic community
    Freshwater Communities & Lentic Waters

    Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..

    Population Regulation in an Ecosystem
    Population Regulation in an Ecosystem

    With regard to the population size of a species and what factors may affect them, two factors have been defined. They ar..

    Young plant growing from the soil.
    Soils

    Nutrients in the soil are essential to the proper growth of a land plant. This tutorial deals with the properties of soi..

    A chart depicting Mendel's Law of Dominance
    Mendel’s Law & Mendelian Genetics

    One of Mendel’s law of inheritance is the “law of dominance”. Read this tutorial to know more about this form of i..

    Physiological Homeostasis
    Physiological Homeostasis

    Homeostasis is essential to maintain conditions within the tolerable limits. Otherwise, the body will fail to function p..