Carbohydrates Definition and Examples
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Questions and Answers

What is the classification of monosaccharides based on the placement of the C=O group?

  • D and L
  • Triose and hexose
  • Diose and heptose
  • Aldo and keto (correct)
  • What is the term for a monosaccharide with three carbon atoms?

  • Tetrose
  • Hexose
  • Pentose
  • Triose (correct)
  • What is the type of bond that links two monosaccharides to form a disaccharide?

  • Glycosidic bond (correct)
  • Hydrogen bond
  • Ionic bond
  • Peptide bond
  • What is the term for a sugar with five carbon atoms?

    <p>Pentose</p> Signup and view all the answers

    What is the biological significance of glucose?

    <p>It is a source of energy for cells</p> Signup and view all the answers

    What is the term for a compound with the same molecular formula but different structural formulas?

    <p>Isomer</p> Signup and view all the answers

    What is the classification of monosaccharides based on the number of carbon atoms?

    <p>Triose, tetrose, pentose, hexose, etc.</p> Signup and view all the answers

    What is the term for a disaccharide composed of glucose and fructose?

    <p>Sucrose</p> Signup and view all the answers

    What is the term for a sugar with six carbon atoms?

    <p>Hexose</p> Signup and view all the answers

    What is the biological significance of lactose?

    <p>It is a component of milk</p> Signup and view all the answers

    Study Notes

    Carbohydrates

    • Carbohydrates are polyhydroxy aldehydes, polyhydroxy ketones, or complex substances that on hydrolysis yield polyhydroxy aldehydes or ketones
    • General formula: Cm(H2O)n
    • Exceptions include:
      • Uronic acids: C6H9O7
      • Fucose: C6H12O5
      • Non-carbohydrates with formula of carbohydrates:
        • Formaldehyde: CH2O
        • Inositol: C6(H2O)6

    Examples of Carbohydrates

    • Glucose: major metabolic fuel of mammals
    • Glycogen: storage in animals
    • Starch: Storage in plants
    • Cellulose: structure in plants and paper
    • Chitin: structure in Arthropods
    • Ribose: RNA, ATP, NAD
    • Deoxyribose: DNA
    • Lactose: milk

    Functions of Carbohydrates

    • Providing energy and regulating blood glucose
    • Sparing the use of proteins for energy
    • Breakdown of fatty acids
    • Biological recognition processes
    • Flavor and sweeteners
    • Dietary fiber

    Importance of Carbohydrates

    • Necessary for regulation of nerve tissue and source of energy for the brain
    • High in fiber, which helps prevent constipation
    • Structural components
    • Important for correct working of brain, heart, nervous, digestive, and immune systems

    Classification of Carbohydrates

    • Monosaccharides:
      • Simplest, colorless, water-soluble, sweet, crystalline solids
      • Classified according to:
        • Placement of C=O group (Aldo, Keto)
        • Number of Carbon atoms (tri, tetra, penta)
        • Chiral Carbon handedness (D, L)
        • Rotation of plane polarized light (d, l)
    • Disaccharides:
      • Examples include lactose, sucrose, maltose
      • Formed by glycosidic bond between two monosaccharides

    Isomerism

    • In chemistry, isomers are compounds with the same molecular formula but different structural formulas

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    Description

    This quiz covers the definition and characteristics of carbohydrates, including their general formula, exceptions, and examples such as glucose and glycogen.

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