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Carbohydrates Knowledge-Based Practice

Biology · Chemistry of Life · Biology · Biological Macromolecules

5 Biology practice questions on Carbohydrates. Questions that assess core concepts and understanding.

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Questions

  1. 1.

    When two hexose monosaccharide molecules with the molecular formula C6H12O6\text{C}_6\text{H}_{12}\text{O}_6 combine via a condensation reaction to form a disaccharide, what is the molecular formula of the resulting product?

    • A) C12H24O12\text{C}_{12}\text{H}_{24}\text{O}_{12}
    • B) C12H22O11\text{C}_{12}\text{H}_{22}\text{O}_{11}
    • C) C12H20O10\text{C}_{12}\text{H}_{20}\text{O}_{10}
    • D) C11H22O11\text{C}_{11}\text{H}_{22}\text{O}_{11}
  2. 2.

    Which of the following pairs of monosaccharides correctly represents an aldose and a ketose, respectively, that exist as structural isomers with the molecular formula C6H12O6C_6H_{12}O_6?

    • A) Galactose and glucose
    • B) Ribose and deoxyribose
    • C) Fructose and ribulose
    • D) Glucose and fructose
  3. 3.

    Which of the following carbohydrates contains nitrogen in its monomer units, distinguishing it structurally from pure glucose polymers?

    • A) Chitin
    • B) Amylose
    • C) Glycogen
    • D) Sucrose
  4. 4.

    Which of the following disaccharides is correctly paired with the monosaccharide monomers released upon its hydrolysis?

    • A) Maltose — glucose and galactose
    • B) Sucrose — glucose and fructose
    • C) Lactose — two glucose monomers
    • D) Cellobiose — fructose and galactose
  5. 5.

    Which of the following statements accurately describes the structural distinction between glycogen and cellulose?

    • A) Glycogen consists of unbranched chains of β-glucose units, whereas cellulose is a branched polymer composed of α-glucose units.
    • B) Glycogen is a branched storage polymer composed of α-glucose monomers, whereas cellulose is an unbranched structural polymer composed of β-glucose monomers.
    • C) Glycogen is formed from alternating glucose and galactose subunits, whereas cellulose is constructed entirely from fructose subunits.
    • D) Glycogen forms rigid microfibrils stabilized by hydrogen bonding, whereas cellulose forms helical coils that readily disperse in water.

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