Dictionary > Heptose

Heptose

Definition
noun, plural: heptoses
A seven-carbon monosaccharide or sugar
Supplement
Monosaccharides are the simplest form of carbohydrates. They are classified according to the number of carbon atoms in a monosaccharide. In particular, a heptose is a monosaccharide with seven 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 aldoheptose is a heptose with an aldehyde group. A ketoheptose, in contrast, is a heptose with a ketone functional group located in position 2.
Aldoheptoses have five chiral centers. An example of a naturally-occurring aldoheptose is L-glycero-D-manno-heptose. It is a heptose with a chemical formula of C7H14O7. It is an intermediate in lipid A biosynthesis. It occurs in plants, e.g. carrots, apricots, and apples.
Ketoheptoses have four chiral centers. An example of a naturally-occurring ketoheptose is sedoheptulose. It has a chemical formula of C7H14O7. It is an early intermediate in lipid A biosynthesis. It is found in alfalfa, avocado, and fig. Another example of a ketoheptose is mannoheptulose. It is a heptose found in avocados.
Word origin: hept(a)– (“seven”) + –ose (relating to sugars)
See also:


You will also like...

IQ, Creativity and Learning
IQ, Creativity and Learning

Human intelligence provided the means to utilize abstract ideas and implement reasoning. This tutorial takes a further l..

Evolution of Life - Ancient Earth
Evolution of Life – Ancient Earth

Autotrophs flourished, absorbing carbon and light. Soon after, primitive life forms that could assimilate oxygen thrived..

Psychiatry and mental disorders
Psychiatry & Mental Disorders

Different mental disorders are described here. Read this tutorial to get an overview of schizophrenia, affective mood di..

An artist's depiction of the origin of amphibians
Amphibians & Early Reptiles

Obtaining air outside an aquatic environment required species to acquire suitable adaptations, and this was the case of ..

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..

Human perception in action
Human Perception – Neurology

This tutorial investigates perception as two people can interpret the same thing differently. Know more about human perc..