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Chapter 1: Problem 20

What are the two major biological roles of polysaccharides?

Short Answer

Expert verified
Polysaccharides function in energy storage and structural support.

Step by step solution

01

Understanding Polysaccharides

Polysaccharides are long chains of monosaccharides linked by glycosidic bonds. They are complex carbohydrates that can have either linear or branched structures depending on the connections between the sugar units.
02

Role 1 - Energy Storage

The first major role of polysaccharides is to store energy. Polysaccharides like starch in plants and glycogen in animals serve as reservoirs of glucose, which can be quickly mobilized to meet energy demands.
03

Role 2 - Structural Support

The second major role of polysaccharides is providing structural support. For plants, cellulose is a primary component of the cell wall, lending rigidity and strength. In fungi and arthropods, chitin serves a similar structural role.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Energy Storage
Polysaccharides play a crucial role in energy storage for both plants and animals. These complex carbohydrates are essentially long chains of glucose, a simple sugar, stored for when the organism needs energy. You can think of them as biological batteries.
  • Plants store energy in the form of starch. Starch can be found in crops like potatoes, rice, and wheat. When a plant requires energy to grow or blossom, enzymes break down starch into glucose.
  • Animals, on the other hand, store energy using glycogen. Glycogen is primarily found in the liver and muscle tissues. It acts as a quick source of glucose in between meals.
Storing energy in these forms allows organisms to efficiently manage their energy resources, ensuring that they have enough power to carry out necessary functions during periods when food is not immediately available.
Structural Support
Polysaccharides are not only vital for energy storage. They are equally important in providing structural support to various organisms. They form the basis of robust structures, enabling plants, fungi, and some animals to maintain their shape.
  • Cellulose is the primary structural component in plant cell walls. This complex carbohydrate provides rigidity and strength, which is why trees stand tall and leaves are firm.
  • In animals like crustaceans and insects, chitin serves a similar structural purpose. The exoskeleton of a crab or the exterior of an insect might be flexible, but it's surprisingly strong due to chitin.
The durability provided by these polysaccharides is essential for protection and form. Without them, many organisms wouldn't be able to preserve their structural integrity.
Monosaccharides
At the heart of polysaccharides are small building blocks known as monosaccharides. These are the simplest forms of carbohydrates and serve as the fundamental units from which polysaccharides are constructed.
Monosaccharides like glucose, fructose, and galactose are single sugar molecules. Though simple, they fuel many of the body's metabolic functions. They are solubilized in the body and can be swiftly absorbed into the bloodstream.
  • For polysaccharides to be used as energy or structural support, they must first be broken down into monosaccharides through digestion or other biological processes.
  • When monosaccharides are linked together, they form complex structures that provide the energy storage and structural characteristics discussed above.
Understanding these sugar molecules helps explain why polysaccharides are a versatile and essential class of biomolecules.
Glycosidic Bonds
Glycosidic bonds are the special connections that link monosaccharide units together to create polysaccharides. These bonds are crucial because they determine the specific properties and functions of the resulting polysaccharide.
  • A glycosidic bond is formed when a chemical reaction occurs between two sugar molecules. This reaction results in the release of a water molecule, a process known as a dehydration reaction.
  • The way glycosidic bonds form can influence the shape and function of the polysaccharide. For instance, the bonds in cellulose align the sugar units in a linear fashion, allowing them to tightly pack and provide structural integrity.
  • In contrast, the branched formation of starch due to different types of glycosidic bonds makes it excellent for easy breakdown into glucose units for energy.
Understanding glycosidic bonds is key to grasping how various polysaccharides perform their roles in nature.

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Most popular questions from this chapter

Consider the monosaccharide fructose. a. How does its molecular formula differ from that of glucose? b. How does its structure differ from the structure of glucose?

The nutritive quality of food can be analyzed by measuring the amounts of the chemical elements it contains. Most foods are mixtures of the three major types of molecules: a. fats (lipids), b. carbohydrates, and c. proteins. What elements are present in each of these types of molecules?

Urea \(\left(\mathrm{NH}_{2} \mathrm{CONH}_{2}\right)\) dissolves readily in water; i.e., this is a spontaneous process. The beaker containing the dissolved compound is cold to the touch. What conclusions can you make about the sign of the a. enthalpy change and b. entropy change for this process?

Which has the greater entropy, a polymeric molecule or a mixture of its constituent monomers?

Glucose can be converted to glucose-6-phosphate: glucose \(+\) phosphate \(\rightarrow\) glucose-6-phosphate \(+\mathrm{H}_{2} \mathrm{O}\) \(\Delta G=13.8 \mathrm{~kJ} \cdot \mathrm{mol}^{-1}\) a. Is this reaction favorable? Explain. b. Suppose the synthesis of glucose-6-phosphate is coupled with the hydrolysis of ATP. Write the overall equation for the coupled process and calculate the \(\Delta G\) for the coupled reaction. Is the conversion of glucose to glucose-6-phosphate favorable under these conditions? Explain. $$ \mathrm{ATP}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{ADP}+\text { phosphate } \quad \Delta G=-30.5 \mathrm{~kJ} \cdot \mathrm{mol}^{-1} $$
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