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what are the diffraction forms of glucoses in to with it is converted |
Monosaccharides (e.g. glucose) and disaccharides (e.g. sucrose) are relatively small molecules. They are often called sugars. Other carbohydrate molecules are very large (polysaccharides such as starch and cellulose).There are two forms of the cyclic glucose molecule: ?-glucose and ?-glucose. Two glucose molecules react to form the dissacharide maltose. Starch and cellulose are polysaccharides made up of glucose units. Galactose Galactose molecules look very similar to glucose molecules. They can also exist in ? and ? forms. Galactose reacts with glucose to make the dissacharide lactose.However, glucose and galactose cannot be easily converted into one another. Galactose cannot play the same part in respiration as glucose.Fructose, glucose and galactose are all hexoses. However, whereas glucose and galactose are aldoses (reducing sugars), fructose is a ketose (a non-reducing sugar). It also has a five-atom ring rather than a six-atom ring. Fructose reacts with glucose to make the dissacharide sucrose. Ribose and deoxyribose are pentoses. The ribose unit forms part of a nucleotide of RNA. The deoxyribose unit forms part of the nucleotide of DNA. |