Question Video: Describing the Relationship between Monosaccharides and Polysaccharides | Nagwa Question Video: Describing the Relationship between Monosaccharides and Polysaccharides | Nagwa

Question Video: Describing the Relationship between Monosaccharides and Polysaccharides Biology • First Year of Secondary School

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Which of the following best describes the relationship between monosaccharides and polysaccharides? [A] Monosaccharides can be broken down to form polysaccharides. [B] Many monosaccharides can join together to form a polysaccharide. [C] Polysaccharides have complementary binding sites to monosaccharides. [D] Monosaccharides can be joined together by bonds called polysaccharides.

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Video Transcript

Which of the following best describes the relationship between monosaccharides and polysaccharides? (A) Monosaccharides can be broken down to form polysaccharides. (B) Many monosaccharides can join together to form a polysaccharide. (C) Polysaccharides have complementary binding sites to monosaccharides. Or (D) monosaccharides can be joined together by bonds called polysaccharides.

Let’s start by reviewing some terms. A saccharide is a technical name for a sugar or carbohydrate, carbohydrates being one of the classes of molecules that we often see in biology. The prefix mono- means one, while the prefix poly- means many. When we talk about the chemical structures of macromolecules, we use the term monomer to refer to one unit of the smallest unit found in that structure and we use the word polymer to refer to multiple monomers joined together into one molecule.

Within one class of macromolecules, there may be multiple types of monomers such as monomer A and monomer B shown here. Within the carbohydrates or saccharides, for example, the monomers include glucose and fructose. If we join these monomers together, we get a polymer. The polymer can consist of two different monomers joined together. As we see here, this joining of glucose and fructose would in fact create the polymer sucrose. Or a polymer can consist of multiple instances of the same monomer joined together as we see in the case of the polymer maltose, which consists of two glucose molecules joined together to make the molecule.

So in this question, we’re asked to describe the relationship between monosaccharides and polysaccharides. According to the definitions we just went over, a monosaccharide would be a single sugar of the smallest unit, for example, glucose or fructose, while a polysaccharide would be a molecule that consists of multiple monosaccharides joined together such as the sucrose or maltose that we saw in our example. So what is the relationship between monosaccharides and polysaccharides? (B) Many monosaccharides can join together to form a polysaccharide.

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