Which of the following statements is true? (a) amylopectin is composed of (14)linked D-glucuronic acids (b) D-xylose and D-ribose units (c) glucose and fructosejoined by 12 linkage (d) D-glucose units joined by 1 4 linkage
Question
Which of the following statements is true? (a) amylopectin is composed of (14)linked D-glucuronic acids (b) D-xylose and D-ribose units (c) glucose and fructosejoined by 12 linkage (d) D-glucose units joined by 1 4 linkage
Solution
The correct statement is (d) D-glucose units joined by 1 4 linkage.
Amylopectin is a type of polysaccharide found in plants, specifically in the starch. It is composed of D-glucose units linked by α 1→4 glycosidic bonds. Branches are formed by α 1→6 glycosidic bonds. Therefore, statement (a) is incorrect.
D-xylose and D-ribose are monosaccharides, not polysaccharides like amylopectin, so statement (b) is incorrect.
Glucose and fructose joined by an α 1→β2 linkage describes the structure of sucrose, a disaccharide, not amylopectin, so statement (c) is incorrect.
Statement (d) is correct because amylopectin is composed of D-glucose units joined by α 1→4 linkages.
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