when two monosaccharides undergo a dehydration synthesis which is formed
This difference in structure gives the two monosaccharides slightly different chemical properties. Disaccharides are formed by linking two monosaccharides together by a dehydration synthesis reaction. A molecule of water is formed in the process. Maltose (malt sugar) is formed by joining two glucose molecules together. Sucrose (cane sugar) is formed by combining glucose and fructose.