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Chitin quiz

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  • What type of polysaccharide is chitin?
    Chitin is a homopolysaccharide, meaning it is composed of only one type of repeating sugar unit.
  • What is the repeating sugar unit in chitin called?
    The repeating sugar unit in chitin is N-acetylglucosamine (NAG).
  • How is N-acetylglucosamine (NAG) derived from β-D-glucose?
    NAG is derived by replacing the hydroxyl group at carbon 2 of β-D-glucose with an N-acetyl group.
  • What type of bond links NAG units in chitin?
    NAG units in chitin are linked by β-1,4-glycosidic bonds.
  • What structural function does the β-configuration of chitin’s glycosidic linkages provide?
    The β-configuration confers a structural function, making chitin rigid and strong.
  • Is chitin a branched or unbranched polysaccharide?
    Chitin is an unbranched polysaccharide.
  • What organisms commonly contain chitin?
    Chitin is found in the exoskeletons of insects and crustaceans.
  • What is the abbreviation for N-acetylglucosamine?
    The abbreviation for N-acetylglucosamine is NAG.
  • What element is present in NAG that makes it an amino sugar?
    NAG contains a nitrogen atom, making it an amino sugar.
  • What is the main biological role of chitin?
    Chitin provides structural support and rigidity in the exoskeletons of certain animals.
  • What is replaced in β-D-glucose to form NAG?
    The hydroxyl group at carbon 2 is replaced with an N-acetyl group to form NAG.
  • What type of animals use chitin for their exoskeletons?
    Insects and crustaceans use chitin for their hard exoskeletons.
  • What is the significance of chitin’s β-1,4-glycosidic linkages?
    These linkages provide structural integrity and rigidity to chitin.
  • Why is chitin considered a structural biopolymer?
    Chitin’s β-glycosidic linkages and unbranched structure make it strong and suitable for structural roles.
  • What feature distinguishes NAG from regular glucose?
    NAG has an N-acetyl group at carbon 2, unlike regular glucose.