Chapter 11: Problem 15

Why are carbohydrates called saccharides?

Short Answer

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Carbohydrates are called saccharides because they are primarily composed of sugar molecules. The term "saccharide" originates from the Greek word "sákcharon," meaning sugar, and highlights carbohydrates' nature as sugar-based organic compounds. Carbohydrates, which include monosaccharides, disaccharides, and polysaccharides, serve as a primary energy source for living organisms.

Step by step solution

Introduction to Carbohydrates

Carbohydrates are a group of organic compounds that mainly consist of carbon, hydrogen, and oxygen atoms. They serve as an essential energy source for living organisms.

Types of Carbohydrates

Carbohydrates can be classified into three main categories: monosaccharides, disaccharides, and polysaccharides. Monosaccharides are the simplest form of carbohydrates, consisting of a single sugar unit. Disaccharides are formed by the joining of two monosaccharide units, while polysaccharides consist of a long chain of monosaccharide units bound together.

Etymology of the Term "Saccharide"

The term "saccharide" has its roots in the Greek word "sákcharon," which means sugar. The suffix "-ide" is derived from the Latin "-idus," which was used to indicate a derived or composed substance.

Link Between "Saccharide" and Carbohydrates

Since carbohydrates are composed of sugar molecules (mono-, di-, or polysaccharides), they are called saccharides. The Greek origin of the word acknowledges that these biomolecules are primarily composed of sugar-based structures.

Conclusion

In conclusion, carbohydrates are called saccharides due to their composition of sugar molecules, with the term "saccharide" originating from the Greek word "sákcharon," meaning sugar. The naming highlights their nature as sugar-based organic compounds that serve as a primary energy source for organisms.

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Key Concepts

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

Monosaccharides

Monosaccharides are often referred to as the building blocks of carbohydrates. They consist of only one sugar molecule, making them the simplest form of carbohydrates. These molecules have the general formula of \( C_n(H_2O)_n \) where \( n \) is typically 3 to 7.

For example, glucose, fructose, and galactose are all monosaccharides with the same molecular formula \( C_6H_{12}O_6 \) but differ in their chemical structures. This difference in structure results in varying properties for each sugar. Monosaccharides play critical roles in energy production and are also used as building blocks for more complex carbohydrates like disaccharides and polysaccharides.

Disaccharides

Disaccharides are carbohydrates formed by the chemical bonding of two monosaccharide molecules. The process that links them together is called dehydration synthesis, which involves the removal of a water molecule. This bond is known as a glycosidic bond.

Common examples of disaccharides include sucrose (table sugar), which is a combination of glucose and fructose; lactose, found in milk, composed of glucose and galactose; and maltose, which is formed from two glucose molecules. Disaccharides must be broken down into monosaccharides before our bodies can absorb and use them for energy.

Polysaccharides

Polysaccharides are complex carbohydrates constructed from long chains of monosaccharide units. These chains can be branched or unbranched and contain hundreds to thousands of sugar molecules. They serve various functions such as energy storage and structural support.

Key examples include starch, glycogen, and cellulose. Starch is a storage form of glucose in plants, while glycogen serves as short-term energy storage in animal cells. Cellulose, on the other hand, is a major component of plant cell walls and provides structural support. Unlike monosaccharides and disaccharides, polysaccharides are not sweet-tasting and are generally not water-soluble.

Saccharides Etymology

The term 'saccharides' comes from the Greek word \( sákcharon \) meaning 'sugar'. This etymology reflects the sweet taste of simple sugars and their derivatives.

The suffix '-ide' is of Latin origin, specifically from '-idus', used to denote a substance derived from another. As carbohydrates are compounds derived from basic sugar molecules, the term 'saccharide' aptly describes their composition. This term not only illuminates the chemical nature of these essential molecules but also their historical linguistic roots, connecting the study of biochemistry with that of language.

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Why are carbohydrates called saccharides?

Short Answer

Step by step solution

Introduction to Carbohydrates

Types of Carbohydrates

Etymology of the Term "Saccharide"

Link Between "Saccharide" and Carbohydrates

Conclusion

Key Concepts

Monosaccharides

Disaccharides

Polysaccharides

Saccharides Etymology

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