1.4.1 Monosaccharides, disaccharides and polysaccharides Quiz: Pearson Edexcel Biology, Unit 1

The 20 questions

1. Which of these is a monosaccharide?

   • Glycogen
   • Maltose
   • Sucrose
   • Glucose

2. What is the molecular formula of glucose?

   • C5H10O5
   • C6H12O6
   • C6H10O5
   • C12H22O11

3. Which pair of monosaccharides forms sucrose when joined?

   • Glucose and fructose
   • Glucose and galactose
   • Glucose and glucose
   • Galactose and fructose

4. Which disaccharide is formed from glucose and galactose?

   • Sucrose
   • Lactose
   • Maltose
   • Amylose

5. Which polysaccharide is made of unbranched chains of alpha-glucose units?

   • Amylopectin
   • Amylose
   • Glycogen
   • Sucrose

6. Which glycosidic bonds form the branches in an amylopectin molecule?

   • 1,6-glycosidic bonds
   • 1,4-glycosidic bonds
   • 1,2-glycosidic bonds
   • 2,4-glycosidic bonds

7. Why is glycogen more suitable than amylopectin for rapid energy release in animals?

   • Completely linear
   • More highly branched
   • Soluble in water
   • Slower to hydrolyse

8. Why does insoluble starch store energy in plants without drawing water into cells?

   • Active glucose transport
   • Decreases cytoplasm mass
   • No osmotic effect
   • High water potential

9. What is the relative formula mass of the disaccharide maltose, C12H22O11? (Ar: C = 12, H = 1, O = 16)

   • 180
   • 342
   • 360
   • 162

10. Which monosaccharide is the main product of hydrolysis of starch and glycogen?

    • Glucose
    • Ribose
    • Galactose
    • Fructose

11. Which type of reaction forms a glycosidic bond between two monosaccharides?

    • Condensation reaction
    • Oxidation reaction
    • Reduction reaction
    • Hydrolysis reaction

12. Which molecule is added to break a glycosidic bond during hydrolysis?

    • Glucose
    • Water
    • Oxygen
    • Carbon dioxide

13. What structural feature of glycogen allows enzymes to release many glucose molecules at once?

    • Single long chain
    • High solubility
    • Helical structure
    • Many terminal ends

14. Which polysaccharide is found in the liver and muscles of animals as a storage form of glucose?

    • Amylose
    • Chitin
    • Cellulose
    • Glycogen

15. Which glycosidic bonds form the unbranched helical chain of amylose?

    • 1,4-glycosidic bonds
    • 2,4-glycosidic bonds
    • 1,2-glycosidic bonds
    • 1,6-glycosidic bonds

16. Which type of sugar is produced by the complete hydrolysis of starch?

    • Non-reducing sugar
    • Disaccharide
    • Polysaccharide
    • Reducing sugar

17. Which monosaccharides condense to form one molecule of sucrose?

    • Glucose and fructose
    • Glucose and galactose
    • Two glucose molecules
    • Fructose and galactose

18. How does the structure of amylose differ from glycogen?

    • Amylose contains fructose
    • Glycogen is unbranched
    • Amylose is branched
    • Amylose is unbranched

19. Why does glycogen have more free ends than an amylose molecule of similar mass?

    • It is helical
    • It is branched
    • It is unbranched
    • It is soluble

20. What is produced by the complete hydrolysis of one maltose molecule?

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

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