Disaccharides - Disaccharides are formed when two...

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Disaccharides are formed when two monosaccharides are chemically bonded together. Sucrose, a common plant disaccharide is composed of the monosaccharides glucose and fructose. Lactose, milk sugar, is a disaccharide composed of glucose and the monosaccharide galactose. The maltose that flavors a malted milkshake (and other items) is also a disaccharide made of two glose molecules bonded together as shown in Figure 11. Figure 11. Formation of a disaccharide (top) by condensation and structure of two common disaccharides.Image from Purves et al., Life: The Science of Biology , 4th Edition, by Sinauer Associates and WH Freeman used with permission. Polysaccharides are large molecules composed of individual monosaccharide units. A common plant polysaccharide is starch (shown in Figure 12), which is made up of many glucoses (in a polypeptide these are referred to as glucans). Two forms of polysaccharide, amylose and amylopectin makeup what we commonly call starch. The
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Disaccharides - Disaccharides are formed when two...

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