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Lactose is a reducing sugar composed of one molecule of D-galactose and one molecule of D-glucose joined by a β-1,4-glycosidic bond (the bond from the anomeric carbon of the first monosaccharide unit being directed upward).
Course: AP®︎/College Biology > Unit 1. Lesson 4: Properties, structure, and function of biological macromolecules. Molecular structure of DNA. Antiparallel structure of DNA strands. Molecular structure of RNA. Introduction to amino acids. Overview of protein structure. Introduction to carbohydrates. Carbohydrates.
disaccharide maltose. Because this bond is between carbon 1 of one molecule and carbon 4 of the other molecule it is called a 1-4 glycosidic bond. Bonds between other carbon atoms are possible, leading to different shapes, and branched chains. Three common disaccharides: Sucrose (Glucose + Fructose), Lactose (Glucose + Galactose),
Disaccharides and Glycosidic Bonds. Monosaccharides such as glucose can be linked together in condensation reactions. For example, sucrose (table sugar) is formed from one molecule of glucose and one of fructose, as shown below. Molecules composed of two monosaccharides are called disaccharides.
The most common ones include sucrose (glucose and fructose), lactose (galactose and glucose), and maltose (glucose and glucose). All of the common disaccharides contain at least one glycosidic bond. We name the disaccharides according to which carbons are linked to each other and the how the anomeric carbon of the glycosidic bond is configured.
Carbohydrates are produced by the process of photosynthesis in which six carbon sugars or hexoses are produced using energy of sunlight, green pigment chlorophyll, CO2 and H2O by green plants. The hexoses produced are the raw material for the biosynthesis of glycogen, fats, proteins and nucleic acid in living systems.
31 Μαΐ 2022 · Sucrose is a non-reducing sugar which gives a negative result in a Benedict’s test. When sucrose is heated with hydrochloric acid this provides the water that hydrolyses the glycosidic bond resulting in two monosaccharides that will produce a positive Benedict's test.
