BIOLOGY
DISACCHARIDES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The direction it is bonded (up or down)
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The direction it is bonded (left or right)
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The name of the bond
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The number of acetal bonds
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Detailed explanation-1: -The disaccharides differ from one another in their monosaccharide constituents and in the specific type of glycosidic linkage connecting them. There are three common disaccharides: maltose, lactose, and sucrose. All three are white crystalline solids at room temperature and are soluble in water.
Detailed explanation-2: -Disaccharides are composed of two monosaccharide units linked together by a glycosidic bond. The most common glycosidic bonds connecting monosaccharide units are O-glycosidic bonds in which the oxygen from a hydroxyl group becomes linked to the carbonyl carbon.
Detailed explanation-3: -Disaccharides are crystalline water-soluble compounds. The monosaccharides within them are linked by a glycosidic bond (or glycosidic linkage), the position of which may be designated -or -or a combination of the two (-, -). Glycosidic bonds are cleaved by enzymes known as glycosidases.
Detailed explanation-4: -Sucrose is a disaccharide made up of glucose and fructose with both alpha and beta linkages. Hence, the correct answer is option C. Note: The beta linkage is different from alpha linkage but most carbon atoms involved are fourth carbon from one and first carbon from another.