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Multiple Choice
How many sugar units are bonded together in a disaccharide?
A
Three
B
Four
C
One
D
Two
Verified step by step guidance
1
Understand the definition of a disaccharide: A disaccharide is a type of carbohydrate formed when two monosaccharide sugar units are joined together by a glycosidic bond.
Recall examples of disaccharides: Common disaccharides include sucrose (glucose + fructose), lactose (glucose + galactose), and maltose (glucose + glucose). Each of these consists of two sugar units.
Visualize the structure: Consider the chemical structure of a disaccharide, where two monosaccharide units are linked. This linkage typically involves the removal of a water molecule (condensation reaction) to form the glycosidic bond.
Differentiate from other saccharides: Compare disaccharides with monosaccharides (single sugar unit) and polysaccharides (multiple sugar units, typically more than two). This helps in understanding the unique characteristic of disaccharides having exactly two sugar units.
Conclude based on the definition: Based on the definition and examples, a disaccharide is composed of exactly two sugar units bonded together.