Multiple Choice
One characteristic shared by sucrose, lactose, and maltose is that __________.
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1. Introduction to Biochemistry
Carbohydrates
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Starch and cellulose ________.
A
contain only $eta$-1,4-glycosidic bonds
B
are both digestible by humans
C
are storage polysaccharides in animals
D
are both polymers of glucose but differ in the type of glycosidic linkage
Verified step by step guidance1
Understand the structure of starch and cellulose: Both are polysaccharides composed of glucose monomers, but they differ in the type of glycosidic bonds connecting these monomers.
Learn about the glycosidic linkages: Starch contains α-1,4-glycosidic bonds (and sometimes α-1,6-glycosidic bonds in amylopectin), while cellulose contains β-1,4-glycosidic bonds.
Recognize the implications of glycosidic bond types: The α-1,4-glycosidic bonds in starch are easily hydrolyzed by human enzymes like amylase, making starch digestible. In contrast, the β-1,4-glycosidic bonds in cellulose cannot be broken down by human enzymes, rendering cellulose indigestible.
Differentiate their biological roles: Starch serves as a storage polysaccharide in plants, providing energy when hydrolyzed. Cellulose, on the other hand, is a structural polysaccharide in plant cell walls, providing rigidity and support.
Conclude that starch and cellulose are both polymers of glucose but differ in their glycosidic linkages, digestibility, and biological functions.
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