Which is the simplest polysaccharide

carbohydrates (Saccharides) are macromolecules that only consist of carbon (C), hydrogen (H), and oxygen (O) atoms. As an energy source, carbohydrates in the form of sugar (saccharine = sugar) and starch provide the main part of the daily energy required for the metabolism.

Probably the most elementary carbohydrate is glucose (Glucose). Plants synthesize glucose during photosynthesis from water, carbon dioxide and light energy. 'Superfluous' glucose can be temporarily stored in by plants Strength rebuilt and converted back to glucose when there is a need for energy.
In contrast to autotrophic plants, humans are physiologically unable to meet their energy needs from specially produced carbohydrates. In addition to proteins and fats, carbohydrates, including glucose, get into the body through food.

One gram of carbohydrates has an estimated calorific value of 4 kcal. The energy that the body can use comes from the breakdown of carbohydrates, especially during the Glycolysis and in Citric Acid Cycle. The universal energy carrier is created as a by-product in a series of complex chemical reactions Adenosine triphosphate (ATP). Every smallest movement of the body requires the presence of ATP.

By the way: our brain also covers its energy needs almost exclusively from burning glucose. About 20% of the daily supplied energy is used by the brain alone.