The bonds that hold these sugars together are called glycoside bonds. The linkage between the glucose and fructose molecules in sucrose occurs through the 1 st and 2 nd carbons of glucose and fructose, respectively. Refer to the above graphics for clarification of the shapes of these bonds. The polysaccharides are the next carbohydrates of interest. It is also found in fetal hearts and fetal lungs.
Fetal hearts run off glycogen while adult hearts run off lipids.
The glycogen in fetal lungs is necessary to form surfactant to make oxygen passage into the body from the lungs easier when the fetus is in room air rather than the womb. Having both 1 to 4 and 1 to 6 links lets the glycogen molecule become very dense and be very efficient for storage. The color obtained is amber red and may be stabilized with the addition of the dihydrate of calcium chloride. Each glycogen molecule contains approximately 100,000 molecules of glucose per molecule of glycogen. Cellulose, our last carbohydrate, is a bit different.