Multiple Choice
Which of the following best describes the primary structural difference between starch and cellulose?
16
views
1. Introduction to Biochemistry
Carbohydrates
Struggling with Biochemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which disaccharide is joined by an $\alpha(1\rightarrow4)$ glycosidic bond?
A
Lactose
B
Maltose
C
Cellobiose
D
Sucrose
Verified step by step guidance1
Understand the structure of a glycosidic bond: An $ ext{α}(1
ightarrow4)$ glycosidic bond connects the anomeric carbon (carbon 1) of one sugar molecule in the alpha configuration to the hydroxyl group on carbon 4 of another sugar molecule.
Review the structures of the disaccharides provided: Lactose, Maltose, Cellobiose, and Sucrose. Each disaccharide has a unique glycosidic bond type and sugar composition.
Analyze Maltose: Maltose is composed of two glucose molecules joined by an $ ext{α}(1
ightarrow4)$ glycosidic bond. This bond specifically connects the anomeric carbon of the first glucose (in the alpha configuration) to the hydroxyl group on carbon 4 of the second glucose.
Compare the glycosidic bonds in the other disaccharides: Lactose has a $eta(1
ightarrow4)$ glycosidic bond, Cellobiose has a $eta(1
ightarrow4)$ glycosidic bond, and Sucrose has an $ ext{α}(1
ightarrow2)$ glycosidic bond.
Conclude that Maltose is the correct answer because it is the only disaccharide in the list joined by an $ ext{α}(1
ightarrow4)$ glycosidic bond.
Related Videos
Related Practice
