Lesson 3.1.2.1

3.1.2.1 Monosaccharides, disaccharides and glycosidic bonds Quiz: AQA Biology, Unit 1

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.1.2.1, Monosaccharides, disaccharides and glycosidic bonds: 20 multiple choice questions for the AQA Biology (7402), Unit 1: Biological molecules, written with Revision Ninja.

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The 20 questions

  1. Which monosaccharide is an isomer of glucose with a ketone group on carbon 2?

    • Galactose
    • Maltose
    • Ribose
    • Fructose

  2. Which disaccharide is formed by the condensation of a glucose molecule and a fructose molecule?

    • Lactose
    • Maltose
    • Sucrose
    • Cellulose

  3. Which disaccharide is made from glucose and galactose?

    • Maltose
    • Glycogen
    • Sucrose
    • Lactose

  4. Which disaccharide is formed by the condensation of two glucose molecules?

    • Sucrose
    • Lactose
    • Maltose
    • Fructose

  5. What type of bond joins two monosaccharides in a disaccharide?

    • Phosphodiester bond
    • Ester bond
    • Glycosidic bond
    • Peptide bond

  6. What is a monosaccharide?

    • A sugar made from two linked units that can be split by hydrolysis with no exceptions
    • A single sugar unit that cannot be broken down further by hydrolysis
    • A sugar molecule that always contains exactly five carbon atoms
    • A chain of many glucose units joined by glycosidic bonds

  7. Which of these is a monosaccharide?

    • Sucrose
    • Galactose
    • Lactose
    • Maltose

  8. How many carbon atoms does a hexose monosaccharide such as glucose contain?

    • 6
    • 12
    • 3
    • 5

  9. What is the difference between alpha-glucose and beta-glucose?

    • The alpha form is a disaccharide while the beta form is a monosaccharide
    • The alpha form has an extra carbon atom in its ring than the beta form
    • The position of the -OH group on carbon 1 differs, below the ring in alpha and above it in beta
    • The beta form contains a ketone group while the alpha form contains an aldehyde

  10. Lactose is hydrolysed completely. Which monosaccharides are produced?

    • Glucose and fructose
    • Glucose and galactose
    • Two molecules of glucose
    • Galactose and fructose

  11. A solution contains 360 g of glucose, which is condensed completely into maltose. What mass of maltose is formed? (Glucose 180, maltose 342)

    • 342 g
    • 324 g
    • 378 g
    • 360 g

  12. Which pairing of disaccharide and its component monosaccharides is correct?

    • Lactose: glucose and fructose
    • Sucrose: glucose and fructose
    • Sucrose: glucose and galactose
    • Maltose: glucose and fructose

  13. A student completely hydrolyses 1 mole of sucrose. Which products are formed?

    • 2 moles of glucose
    • 1 mole of glucose and 1 mole of fructose
    • 1 mole of glucose and 1 mole of galactose
    • 2 moles of fructose

  14. Two moles of glucose and two moles of fructose undergo condensation to form only sucrose. How many moles of sucrose and of water are formed?

    • 2 moles of sucrose and 4 moles of water
    • 4 moles of sucrose and 4 moles of water
    • 2 moles of sucrose and 2 moles of water
    • 1 mole of sucrose and 1 mole of water

  15. A student says that sucrose and maltose are both formed only from glucose. Which evaluation is correct?

    • Incorrect, because maltose contains galactose as its second monomer
    • Incorrect, because sucrose contains fructose and so is not formed from glucose alone
    • Correct, because all disaccharides contain only glucose monomers
    • Correct, because both disaccharides are made from two molecules of glucose

  16. Glucose, galactose and fructose all have the formula C6H12O6. What explains why they form different disaccharides?

    • They contain different numbers of oxygen atoms that alter the glycosidic bond
    • They are structural isomers with different arrangements of atoms, which changes how they bond
    • They are different elements, so only certain pairs can bond together
    • They contain different numbers of hydrogen atoms that change which bonds form

  17. Sucrose is heated with dilute hydrochloric acid. Which products are formed?

    • Two molecules of maltose
    • Glucose and galactose
    • Glucose and fructose
    • Fructose and galactose

  18. Which statement correctly describes galactose compared with glucose?

    • Galactose is a disaccharide made from two glucose units, whereas glucose is a single sugar unit with a ring
    • Galactose has a higher molecular mass than glucose because it contains an extra oxygen atom in its ring
    • Galactose has five carbon atoms, while glucose has six, so the two sugars form different disaccharides with fructose
    • Both are hexoses with the formula C6H12O6, but they differ in the arrangement of atoms around the ring

  19. Which of these is a pentose monosaccharide?

    • Glucose
    • Ribose
    • Fructose
    • Galactose

  20. How many glycosidic bonds are present in a single molecule of a disaccharide?

    • 1
    • 0
    • 2
    • 3

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