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Chapter 20: Problem 3

What type of reaction changes sugars into polysaccharides?

Short Answer

Expert verified
The type of reaction that changes sugars into polysaccharides is a dehydration synthesis or condensation reaction.

Step by step solution

01

Understanding Sugars and Polysaccharides

Sugars are simple carbohydrate molecules, while polysaccharides are complex carbohydrates. Polysaccharides are made up of long chains of sugars.
02

Identifying the Reaction Type

The process of converting sugars (monosaccharides) into polysaccharides involves the formation of a bond between two sugar molecules, which results in the elimination of a water molecule. This is typical of a type of reaction known as a dehydration synthesis or condensation reaction.

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Key Concepts

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

Polysaccharides
Polysaccharides are complex carbohydrates, and their name derives from the Greek words "poly," meaning many, and "saccharides," meaning sugars. They are large molecules composed of long chains of monosaccharide units linked together. These molecules serve diverse functions in living organisms.
  • Storage: Polysaccharides like glycogen in animals and starch in plants serve as important forms of energy storage. They are easily converted to glucose when needed for metabolic processes.
  • Structural support: Cellulose is a polysaccharide that provides rigidity and structural integrity to plant cell walls, helping them maintain their shape.
  • Functionality: They also play roles in cellular communication and adhesion.
Their branched or linear structure depends on the specific arrangement and type of monosaccharides that compose them. Due to this, polysaccharides have varying degrees of solubility in water, affecting their biological activity.
Monosaccharides
Monosaccharides are the most basic form of carbohydrates, often referred to as simple sugars. They are the building blocks that form complex carbohydrates like polysaccharides.
Monosaccharides typically follow the formula \[(C_nH_{2n}O_n)\]where \(n\) is usually between 3 and 7. This leads to sugars like glucose, fructose, and galactose.
  • Glucose: Often dubbed the "energy currency" of cells, glucose is central to energy production in living organisms.
  • Fructose: Found in many fruits, it is sweeter than glucose and used commonly in sweeteners.
  • Galactose: Combines with glucose to form lactose, the sugar found in milk.
Unlike polysaccharides, monosaccharides are directly absorbed into the bloodstream, making them crucial for immediate energy needs.
Condensation Reaction
A condensation reaction, also known as dehydration synthesis, is a chemical process where two molecules combine to form a larger molecule, releasing a small molecule in the process鈥攊n this case, water.
This type of reaction is fundamental in the formation of complex carbohydrates. During the synthesis of polysaccharides, each bond between monosaccharide units is formed by such a reaction.
  • Bond Formation: The hydroxyl (-OH) group from one sugar and an -H atom from the other sugar's hydroxyl group combine to release a water molecule (\[H_2O\]) and form a glycosidic bond.
  • Energy Requirement: Condensation reactions often require an input of energy to facilitate the bond formation. This energy is typically provided by ATP in cellular reactions.
  • Reversibility: While condensation reactions form polymers from monomers, they can be reversed through hydrolysis. In hydrolysis, a molecule of water is added to break the bond.
Understanding these reactions helps us appreciate how simple sugars come together to create the vast array of complex carbohydrates found in bioorganic chemistry.

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