Carbohydrates Chemistry Quiz
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Questions and Answers

Which of the following polysaccharides acts as a plant food reserve?

  • Hyaluronic acid
  • Cellulose
  • Starch (correct)
  • Glycogen
  • Branch points in starch and glycogen are due to formation of ______ glycosidic bonds between glucose residues.

    α(1→6)

    In amylopectin, branching is observed at the interval of every ______ glucose residues.

  • 40-50
  • 12-20
  • 8-14
  • 24-30 (correct)
  • Which of the following disaccharides is obtained by digestion of amylose by the enzyme amylase?

    <p>Maltose (C)</p> Signup and view all the answers

    Which of the following polysaccharides is found in plant fibers?

    <p>Cellulose (A)</p> Signup and view all the answers

    Which of the following mucopolysaccharides is not sulfated?

    <p>Hyaluronic acid (C)</p> Signup and view all the answers

    Which of the following does not have nutritional value?

    <p>Chitin (B)</p> Signup and view all the answers

    Match the following:

    <p>Chitin = Insects Keratan sulfate = Cartilage and tendons Iodine = Starch and glycogen Heparin = Extracellular Matrix Hyaluronic acid = Iduronic acid</p> Signup and view all the answers

    Flashcards

    Carbohydrates

    Biopolymers composed of monosaccharide units, essential for life.

    Monosaccharides

    Simple sugars that cannot be hydrolyzed further; examples include glucose.

    Oligosaccharides

    Carbohydrates made of 2-10 monosaccharide units linked together.

    Polysaccharides

    Complex carbohydrates made of 10 or more monosaccharide units.

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    Glycogen

    The storage form of glucose in animals, highly branched structure.

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    Starch

    A polymer of α-glucose used as energy storage in plants; composed of amylose and amylopectin.

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    Amylose

    A linear, unbranched component of starch made of glucose units.

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    Amylopectin

    Highly branched form of starch that contains glucose units.

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    Cellulose

    A structural polysaccharide in plants, providing rigidity and strength.

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    Chitin

    A structural polysaccharide found in exoskeletons of arthropods and cell walls of fungi.

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    Glycosaminoglycans (GAGs)

    Long, unbranched polysaccharides composed of disaccharide units, involved in lubrication and shock absorption.

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    Hyaluronic acid

    A type of GAG that serves as a lubricant in joints and is involved in tissue hydration.

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    Proteoglycans

    Molecules that consist of a protein core and glycosaminoglycan side chains, forming a significant part of the extracellular matrix.

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    Glycoproteins

    Proteins with carbohydrate chains attached; involved in cell recognition and signaling.

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    N-linked glycoproteins

    Glycoproteins with carbohydrates attached to the nitrogen of asparagine residues.

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    O-linked glycoproteins

    Glycoproteins with carbohydrates linked to oxygen of serine or threonine residues.

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    Homopolysaccharides

    Polysaccharides formed from repeating units of the same monosaccharide.

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    Heteropolysaccharides

    Polysaccharides made up of different types of monosaccharides.

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    Glycosidic bonds

    Links between monosaccharides formed during the condensation reactions to create polysaccharides.

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    Mucopolysaccharidoses

    Genetic disorders caused by the accumulation of glycosaminoglycans due to enzyme deficiencies.

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    Glycolipids

    Lipids with attached carbohydrates, serving as markers for cell recognition.

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    Cell signaling

    Biological processes in which cells communicate with each other, often involving glycoproteins.

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    Blood types

    Determined by glycoproteins on red blood cells, critical for transfusions.

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    Glycosylation

    The process of adding carbohydrate chains to proteins or lipids, important for function.

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    Clinical significance of GAGs

    Glycosaminoglycans are important for tissue building, maintaining water balance, and cell signaling.

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    GAGs in diseases

    Involvement of glycosaminoglycans in various diseases like arthritis and cancer progression.

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    Reproductive functions of glycoproteins

    Glycoproteins assist in sperm-egg interactions and other reproductive processes.

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    Enzyme replacement therapy (ERT)

    Treatment for mucopolysaccharidoses, providing lacking enzymes.

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    Mucoproteins

    Glycoproteins with high carbohydrate content, found in mucus, involved in protection and lubrication.

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    Chondroitin sulfate

    A type of GAG important for cartilage structure and function.

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    Study Notes

    Carbohydrates Chemistry

    • Carbohydrates are organic molecules composed of carbon, hydrogen, and oxygen.
    • They are polymers, meaning they are large molecules made up of simple units (monomers) repeated many times.
    • The most common monomer is glucose.
    • Carbohydrates are classified into monosaccharides, oligosaccharides, and polysaccharides based on the number of monosaccharide units.
    • Monosaccharides are the simplest units that cannot be further hydrolyzed.
    • Oligosaccharides contain 2–10 monosaccharide units.
    • Polysaccharides contain 10–100 or more monosaccharide units/residues, linked by glycosidic bonds.
    • Polysaccharides are also known as glycans.

    Polysaccharides

    • Polysaccharides are complex carbohydrates with multiple monosaccharides bonded together.
    • They are often insoluble in water, amorphous, and non-sweet.
    • Common examples include starch, cellulose, glycogen, and chitin.
    • Starch: Plant storage form of glucose
    • Cellulose: Structural component of plant cell walls.
    • Glycogen: Animal storage form of glucose.
    • Chitin: Forms the exoskeletons of some animals and the cell walls of fungi.

    Classification of Polysaccharides

    • Homopolysaccharides: Composed of the same type of monosaccharide.
    • Heteropolysaccharides: Composed of different types of monosaccharides.

    Starch

    • Starch is a polymer of α-glucose.
    • It is a mixture of amylose and amylopectin.
    • Amylose: Linear, unbranched chain.
    • Amylopectin: Branched chain.
    • Both are storage forms of glucose in plants.

    Glycogen

    • Glycogen is an animal storage form of glucose.
    • Structurally similar to amylopectin but more branched.
    • It's stored mainly in the liver and muscles.
    • Glycogenolysis is the breakdown of glycogen into glucose when energy is needed.

    Cellulose

    • Cellulose is a structural polysaccharide found in plant cell walls.
    • It's composed of linear unbranched chains of glucose.
    • The glycosidic linkages give it a strong and rigid structure.

    Chitin

    • Chitin is a structural polysaccharide found in the exoskeletons of insects and crustaceans.
    • It's also a component of fungal cell walls.
    • Composed of N-acetyl-β-D-glucosamine.

    Glycosaminoglycans (GAGs)

    • GAGs are long unbranched polysaccharides, also called mucopolysaccharides.
    • Composed of repeating disaccharide units, containing uronic acids and amino sugars.
    • They are essential components of connective tissues, such as cartilage, tendons, and skin.
    • Hyaluronic acid, chondroitin sulfate, dermatan sulfate, heparin sulfate, and keratan sulfate are examples of GAGs.

    Glycoproteins

    • Glycoproteins are proteins with carbohydrate chains attached (glycosylation).
    • Involved in various cellular processes, including cell-cell recognition, immune responses, and hormone transport.
    • The carbohydrate portion (glycan) can vary widely in structure and composition.
    • There are many applications and functions of glycoproteins.

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    Description

    Test your knowledge on carbohydrates, including their structure, classification, and examples of polysaccharides. This quiz covers key concepts such as monosaccharides, oligosaccharides, and polysaccharides, and their roles in biology. Perfect for students studying organic chemistry or biochemistry.

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