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Chapter 17: Problem 76

Explain why a disaccharide hydrolyzes to glucose faster than a polysaccharide.

Short Answer

Expert verified
Due to their less complex structure, disaccharides hydrolyze into glucose faster than polysaccharides. This is because hydrolysis, the process which breaks down these molecules, works more quickly on simpler molecules with fewer bonds.

Step by step solution

01

- Understanding the structure of Disaccharides and Polysaccharides

A disaccharide is a carbohydrate that is made up of two monosaccharides. Polysaccharides, on the other hand, are larger carbohydrate molecules and are made up of many monosaccharides joined together through glycosidic bonds. By their structures, it is clear a polysaccharide molecule is more complex than a disaccharide.
02

- Understanding Hydrolysis

Hydrolysis is a chemical reaction in which water is used to break down the bonds of a particular substance. In the context of carbohydrates, during hydrolysis, water breaks the glycosidic bond, converting the complex carbohydrate into simpler sugars (monosaccharides or disaccharides).
03

- Relating Hydrolysis speed to molecular complexity

The speed of hydrolysis is inversely proportional to the complexity of the molecule. A simpler molecule such as a disaccharide will have less glycosidic bonds to be broken than a more complex polysaccharide. Consequently, it takes less time to hydrolyze a disaccharide into its individual sugar units than it does a polysaccharide.

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Key Concepts

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

Polysaccharide
Polysaccharides are giant molecules composed of numerous monosaccharide units linked together. They are the carbohydrate versions of complex tissues or structures, often aligning themselves in sequences or chains.

These compounds are essential because they act as storage forms of energy, such as starch in plants and glycogen in animals. They also play structural roles, epitomized by cellulose in plant cell walls. Due to their complexity and size, polysaccharides have numerous glycosidic bonds.

This complexity means more bonds to break down during hydrolysis, making the process slower as compared to simpler carbohydrates.
Hydrolysis
Hydrolysis is a fundamental reaction that involves the use of water to break down bonds within a molecule. In the realm of carbohydrates, this reaction targets the glycosidic bonds that connect sugar units.

When a carbohydrate undergoes hydrolysis, water molecules intervene, severing these links and resulting in simpler sugar forms, such as monosaccharides and disaccharides.
  • Hydrolysis is crucial for energy release from carbohydrates.
  • It's also a vital step in digestion, breaking down dietary carbs into glucose.
The speed of hydrolysis is largely dictated by the complexity and size of the carbohydrate molecule involved.
Glycosidic Bonds
Glycosidic bonds are the chemical links formed between sugar molecules in carbohydrates. These links are established through a dehydration reaction, where molecules lose a water molecule to join.

Understanding glycosidic bonds helps in grasping why hydrolysis varies in speed for different carbohydrates. Polysaccharides have numerous glycosidic bonds due to their chain structure, making hydrolysis a time-consuming process.
  • They exist in varied configurations, such as alpha and beta, influencing the properties of the carbohydrate.
  • The ease of breaking these bonds affects how organisms store and use energy.
By knowing the nature of these bonds, one can infer the reactivity and breakdown rate of carbohydrates.
Carbohydrates
Carbohydrates are vital biomolecules composed primarily of carbon, hydrogen, and oxygen. They are a significant source of energy and can be classified based on their structural complexity into monosaccharides, disaccharides, and polysaccharides.

As essential dietary components, they not only provide energy but also play roles in cellular structure and signaling mechanisms. Carbohydrates such as glucose are involved in vital processes like glycolysis, which is essential for cellular energy.
  • Simple carbs like monosaccharides are quick energy sources.
  • Complex carbs like polysaccharides provide sustained energy and fulfill structural roles.
The ease with which carbohydrates are metabolized is closely related to their structure and type.

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