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...

    Darwin's Finches - Natural Selection
    Darwin and Natural Selection

    This tutorial investigates the genetic diversity in more detail. It also delineates how certain alleles are favored over..

    Water Cycle
    The Water Cycle

    The water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, s..

    Stem
    Stems

    Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig ..

    Body temperature regulation by the hypothalamus
    Temperature Regulation in Animals

    This tutorial elucidates body temperature regulation. Know the details here to learn how the body sets the body temperat..

    Early Mammals on Earth
    Early Mammals on Earth

    The Earth's ecosphere was rapidly changing and throwing up a wide range of ecological niches that new adaptive organisms..

    takahē
    Takahē (Porphyrio hochstetteri)

    Meet the colorful takahē, an extremely rare flightless bird. Find out more about its unique features and why they matte..

    Related Articles...

    No related articles found

    See all Related Topics