Textbook Question
What are the disaccharides and polysaccharides present in each of the following?
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1
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Ch.13 Carbohydrates
Timberlake13th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9780134421353
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Table of contents
- Ch.1 Chemistry in Our Lives11
- Ch.2 Chemistry and Measurements80
- Ch.3 Matter and Energy54
- Ch.4 Atoms and Elements51
- Ch.5 Nuclear Chemistry42
- Ch.6 Ionic and Molecular Compounds57
- Ch.7 Chemical Quantities and Reactions41
- Ch.8 Gases29
- Ch.9 Solutions51
- Ch.10 Acids and Bases and Equilibrium65
- Ch.11 Introduction to Organic Chemistry: Hydrocarbons78
- Ch.12 Alcohols, Thiols, Ethers, Aldehydes, and Ketones83
- Ch.13 Carbohydrates54
- Ch.14 Carboxylic Acids, Esters, Amines, and Amides90
- Ch.15 Lipids61
- Ch.16 Amino Acids, Proteins, and Enzymes84
- Ch.17 Nucleic Acids and Protein Synthesis83
- Ch.18 Metabolic Pathways and ATP Production67
Timberlake13th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9780134421353Not the one you use?Change textbook
Chapter 13, Problem 57a
Melezitose, a carbohydrate secreted by insects, has the following Haworth structure:
a. Is melezitose a mono-, di-, or trisaccharide?
Verified step by step guidance1
Step 1: Understand the classification of carbohydrates. Carbohydrates are classified as monosaccharides, disaccharides, or trisaccharides based on the number of sugar units they contain. Monosaccharides have one sugar unit, disaccharides have two, and trisaccharides have three.
Step 2: Analyze the Haworth structure of melezitose. In the Haworth structure, look for the number of sugar rings present. Each sugar ring corresponds to one monosaccharide unit.
Step 3: Count the sugar rings in the structure. If the structure contains three sugar rings, it is a trisaccharide. If it contains two, it is a disaccharide, and if it contains one, it is a monosaccharide.
Step 4: Consider the glycosidic bonds. Trisaccharides are formed when three monosaccharides are linked together by glycosidic bonds. Verify the presence of these bonds in the structure to confirm the classification.
Step 5: Conclude the classification of melezitose based on the number of sugar units and glycosidic bonds observed in the structure.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Carbohydrate Classification
Carbohydrates are classified into three main categories: monosaccharides, disaccharides, and oligosaccharides. Monosaccharides are single sugar units, disaccharides consist of two monosaccharides linked together, and oligosaccharides contain a few (typically 3-10) monosaccharide units. Understanding this classification is essential for determining the type of carbohydrate in question.
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Classification of Carbohydrates Example 1
Haworth Projection
The Haworth projection is a way of representing the cyclic structure of carbohydrates, showing how the atoms are arranged in a ring form. This representation helps visualize the orientation of hydroxyl groups and other substituents, which is crucial for understanding the properties and reactivity of the carbohydrate. Analyzing the Haworth structure can provide insights into whether the carbohydrate is a mono-, di-, or trisaccharide.
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Melezitose Structure
Melezitose is a specific type of disaccharide composed of two glucose units linked by a glycosidic bond. It is important to recognize its structure to classify it correctly. The presence of two sugar units indicates that melezitose is not a monosaccharide, and understanding its formation and linkage can clarify its classification as a disaccharide.
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Related Practice
Textbook Question
Isomaltose, obtained from the breakdown of starch, has the following Haworth structure:
b. What are the monosaccharides in isomaltose?
Textbook Question
Melezitose, a carbohydrate secreted by insects, has the following Haworth structure:
c. Is melezitose a reducing sugar?
Textbook Question
Isomaltose, obtained from the breakdown of starch, has the following Haworth structure:
d. Is this the α or β isomer of isomaltose?
Textbook Question
Isomaltose, obtained from the breakdown of starch, has the following Haworth structure:
a. Is isomaltose a mono-, di-, or polysaccharide?
Textbook Question
Melezitose, a carbohydrate secreted by insects, has the following Haworth structure:
b. What monosaccharides are present in melezitose?