A Level Biology Practice Exam

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Which of the following best describes the nature of polysaccharides?

Polymers of proteins
Polymers of monosaccharides
Monomers of nucleotides
Simple sugars

The correct answer is: Polymers of monosaccharides

Polysaccharides are best described as polymers of monosaccharides. This means that they are large molecules made up of long chains of repeating units called monosaccharides, which are simple sugars. Common examples of polysaccharides include starch, glycogen, and cellulose, all of which are formed by the dehydration synthesis of numerous monosaccharide units linked by glycosidic bonds. The structure of polysaccharides determines their function in biological systems; for instance, starch serves as energy storage in plants, while cellulose provides structural support in plant cell walls. Understanding this relationship between monosaccharides and polysaccharides enhances comprehension of carbohydrate classification and their roles in both energy storage and structural integrity in living organisms.