Dictionary > Hexose

Hexose

Definition
noun, plural: hexoses
A six-carbon monosaccharide
Supplement
Monosaccharides are the simplest form of carbohydrates. They are classified according to the number of carbon atoms in a monosaccharide. In particular, a hexose is a monosaccharide with six carbon atoms. Monosaccharides may also be classified based on the type of carbonyl group they contain. An aldose is a monosaccharide that contains an aldehyde group (-CHO) at position 1 whereas a ketose is one that contains a ketone (C=O) at position 2. Thus, an aldohexose is a hexose with an aldehyde group. A ketohexose, in contrast, is a hexose with a ketone functional group located in position 2.
Aldohexoses have four chiral centers. Because of that there are 16 possible stereoisomers. Examples of aldohexoses are glucose, mannose, galactose, gulose, idose, talose, allose, and altrose. Glucose is a one of the products of photosynthesis in plants and other photosynthetic organisms. It also serves as an important metabolic intermediate of cellular respiration. In animals, an excess of glucose is stored as glycogen. In plants, glucose molecules are stored as repeating units of sugar (e.g. starch).
Ketohexoses have three chiral centers. As such, there are eight possible stereoisomers. Examples of ketohexoses are fructose, piscose, sorbose, and tagatose.
Word origin: hex(a)– (“six”) + –ose” (relating to sugars)
See also:

Related term(s):

  • Hexose monophosphate shunt


  • You will also like...

    sponge
    Primitive Animals

    Life, as we know it today, is presumed to have started in the sea and many of them were likely eukaryotic animal-like or..

    Kidneys
    Kidneys and Regulation of Water and Inorganic Ions

    The kidneys are responsible for the regulation of water and inorganic ions. Read this tutorial to learn about the differ..

    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..

    Genetic engineering
    Genetic Engineering Advantages & Disadvantages

    This tutorial presents the benefits and the possible adverse eventualities of genetic engineering. Know more about this ..

    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..

    temperature - abiotic factor
    Abiotic and Biotic Factors

    This tutorial deals with the abiotic factors of the freshwater environment that determine what sort of life would be sui..

    Related Articles...

    No related articles found

    See all Related Topics