glucose
A hexose (6-carbon) sugar and the most common simple sugar. Glucose is important in animal respiration and other processes in organisms. As a preliminary to respiration, more complex sugars, including dissacharides (e.g., sucrose) and polysacchardides (e.g. starch and cellulose), are broken down into molecules of the less chemically complex glucose. Glucose is also obtained from the deamination of amino acids. Then glucose enters the cell via special molecules, called glucose transporters, found in the cell membrane. Once inside the cell, glucose is broken down to make adenosine triphosphate (ATP) through two different pathways, glycolysis and the citric acid cycle (also known as the Kreb's cycle).
In green plants, glucose is a product of photosynthesis, from carbon dioxide and water, and is stored as starch. In animals, it is stored as glycogen.
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