Observe the following statements.I. Sucrose has glycosidic linkage.II. Cellulose is present in both plants and animals.III. Lactose contains D-galactose and D-glucose units.Which of the following statements are correct?(I), (II) and (III)(I) and (II)(I) and (II)(I) and (III)
Question
Observe the following statements.I. Sucrose has glycosidic linkage.II. Cellulose is present in both plants and animals.III. Lactose contains D-galactose and D-glucose units.Which of the following statements are correct?(I), (II) and (III)(I) and (II)(I) and (II)(I) and (III)
Solution
The correct statements are (I) and (III).
(I) Sucrose does indeed have a glycosidic linkage. This is a type of covalent bond that joins a carbohydrate (sugar) molecule to another molecule (which may or may not be another sugar). In the case of sucrose, it is a disaccharide formed by the glycosidic linkage of glucose and fructose.
(II) Cellulose is not present in both plants and animals. It is a major component of the cell walls of green plants, but animals lack the enzyme necessary to break down cellulose for digestion.
(III) Lactose is a disaccharide sugar that consists of D-galactose and D-glucose units. It is found in milk and is often referred to as milk sugar.
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