Lesson 3.3.3.1

3.3.3.1 Digestion and absorption of food Quiz: AQA Biology, Unit 3

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.3.3.1, Digestion and absorption of food: 20 multiple choice questions for the AQA Biology (7402), Unit 3: Organisms exchange substances with their environment, written with Revision Ninja.

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The 20 questions

  1. Which enzyme hydrolyses starch into maltose in the human digestive system?

    • Lactase
    • Lipase
    • Maltase
    • Amylase

  2. Where are disaccharidases located during carbohydrate digestion in the ileum?

    • Pancreatic secretions
    • Gastric pit secretions
    • Epithelial cell membranes
    • Salivary gland secretions

  3. How do bile salts assist lipase during the digestion of lipids?

    • Emulsify lipid droplets
    • Denature lipid proteins
    • Lower stomach pH
    • Hydrolyse ester bonds

  4. Which enzymes hydrolyse internal peptide bonds within a protein molecule?

    • Dipeptidases
    • Exopeptidases
    • Maltases
    • Endopeptidases

  5. Which ions are co-transported with glucose into ileal epithelial cells?

    • Calcium ions
    • Potassium ions
    • Chloride ions
    • Sodium ions

  6. What role do micelles play in lipid absorption in the ileum?

    • Hydrolyse triglycerides
    • Emulsify fat droplets
    • Transport fatty acids
    • Synthesise chylomicrons

  7. Which enzyme hydrolyses starch into maltose during digestion in mammals?

    • Sucrase
    • Maltase
    • Amylase
    • Lactase

  8. In a Visking tubing model, which digestion product diffuses into the surrounding water?

    • Maltose
    • Amylase
    • Starch
    • Glycogen

  9. How do bile salts increase the rate of lipid digestion by lipase?

    • Emulsifying fat droplets
    • Denaturing enzyme molecules
    • Hydrolysing ester bonds
    • Lowering reaction pH

  10. What directly provides energy for glucose co-transport into ileum epithelial cells?

    • Sodium ion gradient
    • Potassium ion gradient
    • Phosphate transfer
    • Direct ATP hydrolysis

  11. Which enzyme is responsible for hydrolysing peptide bonds within a polypeptide chain in the stomach or small intestine?

    • Endopeptidase
    • Exopeptidase
    • Lipase
    • Dipeptidase

  12. Which disaccharide cannot be hydrolysed if a person lacks membrane-bound maltase?

    • Starch
    • Lactose
    • Sucrose
    • Maltose

  13. Which bond is broken by hydrolysis during protein digestion?

    • Peptide bond
    • Hydrogen bond
    • Glycosidic bond
    • Ester bond

  14. Which ion is co-transported alongside amino acids into ileum epithelial cells?

    • Calcium ion
    • Sodium ion
    • Potassium ion
    • Chloride ion

  15. Which lipid breakdown products are transported by micelles to epithelial cells?

    • Glycerol molecules
    • Fatty acids
    • Glucose molecules
    • Amino acids

  16. Why must large biological molecules be digested before absorption across the ileum?

    • To lower pH
    • To denature enzymes
    • To release ATP
    • To cross membranes

  17. Where are disaccharidases located in the ileum to complete digestion?

    • Stomach lumen
    • Cytoplasm of enterocytes
    • Epithelial cell membrane
    • Pancreatic duct

  18. Which monosaccharide product of maltose hydrolysis is absorbed by co-transport?

    • Glucose
    • Sucrose
    • Galactose
    • Fructose

  19. Which bond is hydrolysed by lipase during lipid digestion?

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

  20. What are the products when a dipeptide is hydrolysed by a dipeptidase?

    • Two glycerol molecules
    • Two glucose molecules
    • Three fatty acids
    • Two amino acids

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