The disaccharide molecule, sucrose is not formed from two glucose molecules. Sucrose is formed from one glucose molecule and one fructose molecule.
a molecule of fructose and a molecule of glucose
Monosaccharides fructose and glucose make up the disaccharide sucrose.
Disaccharides are composed of two carbohydrate molecules, specifically sugars. A very common disaccharide is sucrose, (table sugar) which is composed of a glucose molecule and a fructose molecule.
a dissacharide, also known as a double sugar, is a molecule formed by two monosaccharides; Three common examples are sucrose, lactose, and maltose.
monosaccharide
Glycosidic Linkage
When glucose and fructose are bonded together, they form a disaccharide called sucrose, which is commonly known as table sugar. Sucrose is made up of one molecule of glucose and one molecule of fructose joined together by a glycosidic linkage.
Sucrose is a disaccharide comprised of glucose and fructose. While both glucose and fructose have double bonds, sucrose does not.
sucrose is a disaccharide of glucose and fructose
a molecule of fructose and a molecule of glucose
Monosaccharides fructose and glucose make up the disaccharide sucrose.
Glucose and fructose combine to form sucrose, which is a disaccharide composed of one glucose molecule and one fructose molecule joined together by a glycosidic bond.
lactose
a condensation reaction, which creates a glycosidic bond between the two monosaccharides. This reaction releases a water molecule as a byproduct.
Sucrose (table sugar) is 100% sugar, although it is composed of two separate sugars. Glucose and fructose molecules, are chemically joined to form sucrose molecules.
Fructose and glucose are joined by their glycosidic bond in such a way as to prevent the glucose isomerizing to aldehyde, or the fructose to alpha-hydroxy-ketone form. This stops it reacting to Benidict's reagent. However sucrose indirectly produces a positive result with Benedict's reagent if heated with dilute hydrochloric acid prior to the test, although after this treatment it is no longer sucrose. ;-)
When two single sugars are joined together, they form a disaccharide. Examples include sucrose (glucose + fructose), lactose (glucose + galactose), and maltose (glucose + glucose).