Sugars starch and cellulose are all carbohydrates. They contain carbon, hydrogen and oxygen atoms. The ratio would be one carbon to 2 hydrogens to only 1 oxygen. Sugar and starches are an energy source for all cells and cellulose is the main part of the surrounding plant cells. The term carbohydrate stems from hydrate which comes from water of carbon. This mirrors the ration between hydrogen and oxygen which is 2:1 and this is the same ratio that is found in water. Carbohydrates contain monosaccharides which are simple sugars. A monosaccharide’s hydroxyl group bonds with and oxygen atom and ends up forming a carbonyl group. Depending on where the carbonyl group is the monosaccharides will either be aldehyde or it will be a ketone. Glucose is an important to the monosaccharide’s because it’s used for an energy source for a lot of