Domanda del libro di testo
Consider the trisaccharide A, B, C shown in Problem 20.23.
a. Identify the hemiacetal and acetal linkages.
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Ch.20 Carbohydrates
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187
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TOC.tableOfContents
- Ch.1 Matter and Measurements27
- Ch.2 Atoms and the Periodic Table20
- Ch.3 Ionic Compounds8
- Ch.4 Molecular Compounds23
- Ch.5 Classification & Balancing of Chemical Reactions12
- Ch.6 Chemical Reactions: Mole and Mass Relationships28
- Ch.7 Chemical Reactions: Energy, Rate and Equilibrium64
- Ch.8 Gases, Liquids and Solids24
- Ch.9 Solutions52
- Ch.10 Acids and Bases25
- Ch.11 Nuclear Chemistry22
- Ch.12 Introduction to Organic Chemistry: Alkanes57
- Ch.13 Alkenes, Alkynes, and Aromatic Compounds47
- Ch.14 Some Compounds with Oxygen, Sulfur, or a Halogen50
- Ch.15 Aldehydes and Ketones45
- Ch.16 Amines42
- Ch.17 Carboxylic Acids and Their Derivatives57
- Ch.18 Amino Acids and Proteins82
- Ch.19 Enzymes and Vitamins63
- Ch.20 Carbohydrates44
- Ch.21 The Generation of Biochemical Energy65
- Ch.22 Carbohydrate Metabolism45
- Ch.23 Lipids42
- Ch.24 Lipid Metabolism33
- Ch.25 Protein and Amino Acid Metabolism24
- Ch.26 Nucleic Acids and Protein Synthesis45
McMurry8th EditionFundamentals of General, Organic, and Biological ChemistryISBN: 9780134015187Non è quello che usi tu?Cambia libro di testo
Capitolo 20, Problema 20
During the digestion of starch from potatoes, the enzyme α-amylase catalyzes the hydrolysis of starch into maltose. Subsequently, the enzyme maltase catalyzes the hydrolysis of maltose into two glucose units. Write an equation (in words) for the enzymatic conversion of starch to glucose. Classify each of the carbohydrates in the equation as a disaccharide, monosaccharide, or polysaccharide.
Guida verificata passo dopo passo1
Step 1: Understand the enzymatic process. The problem describes two enzymatic reactions: (1) α-amylase catalyzes the breakdown of starch into maltose, and (2) maltase catalyzes the breakdown of maltose into glucose. These reactions involve hydrolysis, where water is used to break chemical bonds.
Step 2: Write the first reaction in words. Starch, a polysaccharide, is hydrolyzed by the enzyme α-amylase to produce maltose, which is a disaccharide. The reaction can be written as: 'Starch + Water → Maltose (catalyzed by α-amylase)'.
Step 3: Write the second reaction in words. Maltose, a disaccharide, is hydrolyzed by the enzyme maltase to produce two glucose molecules, which are monosaccharides. The reaction can be written as: 'Maltose + Water → 2 Glucose (catalyzed by maltase)'.
Step 4: Combine the two reactions into a single overall equation. The enzymatic conversion of starch to glucose can be summarized as: 'Starch + Water → Glucose (via α-amylase and maltase)'.
Step 5: Classify the carbohydrates. Starch is a polysaccharide, maltose is a disaccharide, and glucose is a monosaccharide. This classification is based on the number of sugar units in each molecule: polysaccharides have many, disaccharides have two, and monosaccharides have one.
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Enzymatic Hydrolysis
Enzymatic hydrolysis is a biochemical process where enzymes catalyze the breakdown of complex molecules into simpler ones by adding water. In the context of starch digestion, α-amylase initiates this process by breaking down starch, a polysaccharide, into maltose, a disaccharide. This reaction is crucial for converting carbohydrates into absorbable sugars.
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Percorso guidato
3:09
Triacylglycerol Reactions: Hydrolysis Concept 1
Carbohydrate Classification
Carbohydrates are classified into three main categories: monosaccharides, disaccharides, and polysaccharides. Monosaccharides are the simplest form, consisting of single sugar units like glucose. Disaccharides, such as maltose, are formed from two monosaccharides, while polysaccharides, like starch, are long chains of monosaccharide units. Understanding these classifications is essential for analyzing the enzymatic conversion process.
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Percorso guidato
1:29Classification of Carbohydrates Example 1
Enzyme Function
Enzymes are biological catalysts that speed up chemical reactions in living organisms without being consumed in the process. In starch digestion, α-amylase and maltase are specific enzymes that facilitate the conversion of starch to glucose by lowering the activation energy required for the hydrolysis reactions. Their specificity and efficiency are vital for proper digestion and nutrient absorption.
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Percorso guidato
02:16Logarithmic Functions
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