Multiple Choice
Which of the following is NOT an example of a carbohydrate?
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1. Introduction to Biochemistry
Carbohydrates
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Which complex carbohydrate contains only \( \alpha \)-1,4-glycosidic bonds in its structure?
A
Amylose
B
Cellulose
C
Glycogen
D
Amylopectin
Verified step by step guidance1
Understand the structure of glycosidic bonds: Glycosidic bonds are covalent bonds formed between carbohydrate molecules. Specifically, an α-1,4-glycosidic bond connects the first carbon (
) of one glucose molecule to the fourth carbon (
) of another glucose molecule in the α-configuration.
Review the structure of Amylose: Amylose is a linear polymer of glucose molecules connected exclusively by α-1,4-glycosidic bonds. This makes it unique among the listed carbohydrates.
Compare with other carbohydrates: Cellulose contains β-1,4-glycosidic bonds, not α-1,4-glycosidic bonds. Glycogen and Amylopectin both contain α-1,4-glycosidic bonds but also have α-1,6-glycosidic bonds at branch points, making their structures branched rather than linear.
Identify the correct carbohydrate: Based on the structural information, Amylose is the only complex carbohydrate in the list that contains exclusively α-1,4-glycosidic bonds without branching.
Conclude the reasoning: Amylose is the correct answer because its structure is linear and composed solely of α-1,4-glycosidic bonds, unlike the other options which either have branching or different types of glycosidic bonds.
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