Problem 23 - Chemistry

Question

Maltose is an example of ______ . (1) oligosaccharide (2) homopolysaccharide (3) heteropolysaccharide (4) monosaccharide

Step-by-Step Solution

Answer

1) Oligosaccharide 2) Homopolysaccharide 3) Heteropolysaccharide 4) Monosaccharide Answer: 1) Oligosaccharide

Step 1: Define the types of carbohydrates

Oligosaccharide: A carbohydrate consisting of a small number of monosaccharides (sugar units) linked together. Typically, oligosaccharides have 2-10 monosaccharides. Homopolysaccharide: Also known as a homoglycan, it is a type of polysaccharide (large carbohydrate) composed of a single type of monosaccharide. Heteropolysaccharide: Also known as a heteroglycan, it is a type of polysaccharide (large carbohydrate) composed of two or more different types of monosaccharides. Monosaccharide: The simplest form of carbohydrates that cannot be hydrolyzed further into simpler sugars. Examples include glucose, fructose, and galactose.

Step 2: Determine the structure of maltose

Maltose, also known as malt sugar, is a disaccharide formed by the condensation reaction (dehydration synthesis) between two glucose molecules. In this reaction, a water molecule is removed, and an alpha-(1,4)-glycosidic bond is formed between the two glucose units.

Step 3: Match maltose with the correct category

Since maltose is a disaccharide consisting of two glucose molecules linked together, it is classified into the category of oligosaccharides, specifically as a disaccharide. Therefore, the correct answer is option (1) oligosaccharide.

Key Concepts

Oligosaccharide

Oligosaccharides are fascinating carbohydrates consisting of a small number of monosaccharide units linked together. Typically, they range from 2 to 10 monosaccharides. An easy way to think about them is as small sugar chains.
Consider them as the middle ground between simple sugars and complex carbohydrates. They are significant in many biological processes and can be found naturally in various plants.
Some common examples of oligosaccharides include raffinose and stachyose. Oligosaccharides play a vital role in cell recognition and signaling in the body.

• They participate in the formation of glycoproteins and glycolipids, which are crucial for cell membrane structure.
• They can also serve as prebiotics, feeding beneficial bacteria in the gut.

Understanding oligosaccharides helps in grasping their importance in both nutrition and biological functions.

Monosaccharide

Monosaccharides are the simplest form of carbohydrates and often referred to as single sugars. These are the building blocks for more complex carbohydrates. Three well-known examples are glucose, fructose, and galactose.
These sugars cannot be hydrolyzed further to yield simpler sugar molecules, meaning they're at the most basic level.
The primary function of monosaccharides is to serve as an energy source for the body.

• Glucose, for example, is critical as it supplies energy to both brain and muscles.
• These sugars also act as precursors for other biomolecules.

Monosaccharides have simple structures, usually with carbon chains containing 3 to 7 carbon atoms. They play a central role in metabolism by being a quick energy source.

Disaccharide

Disaccharides are sugars formed by the union of two monosaccharides. These occur through a condensation reaction, resulting in the loss of one water molecule. A familiar example of a disaccharide is maltose, which consists of two glucose molecules.
Other common disaccharides include sucrose, made up of glucose and fructose, and lactose, composed of glucose and galactose.

• Disaccharides provide a source of energy, similar to monosaccharides, but need to be broken down in digestion before the body uses them.
• They are often found in foods such as sugar, milk, and cereal.

Understanding disaccharides helps appreciate how they supply energy and how they are part of daily nutrition.

Polysaccharide

Polysaccharides are complex carbohydrates composed of large chains of monosaccharide units. Think of them as long, intricate sugar compounds often structured to provide storage or structural functions.
Two main types include homopolysaccharides, composed of just one kind of monosaccharide, and heteropolysaccharides, built from more than one type.
Common examples include starch, glycogen, and cellulose.

• Starch, found in plants, serves as a main energy storage material.
• Glycogen acts in animals in a similar way for energy reserves.
• Cellulose provides structural support in the cell walls of plants.

Their ability to form strong structures makes them essential not only for energy storage but also in forming durable biological materials.