Worksheet: Enzymes in Digestion

In this worksheet, we will practice explaining the action and importance of digestive enzymes.


Which group of digestive enzymes break down proteins?

  • AProtehydrases
  • BAminoases
  • CPectinases
  • DAmylases
  • EProteases


The diagram shows a simplified version of the action of amylase. What subunits is starch broken down into?

  • AAmino acids
  • BGlycerol
  • CGlucose
  • DFatty acids


Which of the following best explains how enzymes aid digestion?

  • AEnzymes break down large, complex food molecules into smaller ones that can be absorbed.
  • BEnzymes slow down the rate of digestion so it does not require too much energy.
  • CEnzymes regulate the pH of the digestive system to ensure it remains at the optimum.
  • DEnzymes are released by the gallbladder to neutralize stomach acid.
  • EEnzymes release energy to aid the physical processes of digestion, such as chewing.


Why are enzymes often included in biological washing powders?

  • AEnzymes help prevent the breakdown of clothing fibers, so clothes last longer.
  • BEnzymes can reduce the amount of water needed in a washing machine.
  • CWashing powders with enzymes smell nicer than washing powders without enzymes.
  • DEnzymes can help break down and remove stains caused by food.


Which of the following best explains why carbohydrates and proteins are classified as polymers?

  • ABecause there are many copies of carbohydrates and proteins within the human body (poly means many)
  • BBecause they are made up of many different large units (monomers)
  • CBecause they are joined up to other biological molecules
  • DBecause they are made up of many similar small units (monomers)


Which of the following organs does not produce any of the digestive enzymes?

  • ASalivary glands
  • BStomach
  • CPancreas
  • DSmall intestine
  • ELiver


The diagram given shows the basic outline of the human digestive system. The pancreas produces and releases a large amount of digestive enzymes. Which number points to the pancreas on the diagram?


What polymers are formed by the joining of amino acids via peptide bonds?

  • ACarbohydrates
  • BLipids
  • CGlycerols
  • DProteins


Which group of digestive enzymes does amylase belong to?

  • ANucleases
  • BProteases
  • CCarbohydrases
  • DLipases


Which biological molecules are formed by the joining of glycerol and fatty acids via covalent bonds?

  • ANucleic acids
  • BLipids
  • CCarbohydrates
  • DProteins


Which digestive enzyme, produced by the salivary gland and pancreas, helps break down starch?

  • AMaltase
  • BAmylase
  • CPectinase
  • DPepsin
  • ETrypsin


Which group of digestive enzymes breaks down fats and oils?

  • AMaltases
  • BAmylases
  • CProteases
  • DFateases
  • ELipases


The diagram shows a simplified version of protease action. What monomer subunits are proteins broken down into?

  • AFatty acids
  • BGlucose
  • CGlycerol
  • DAmino acids


Complete the table to state the correct enzyme, substrate, and product(s).

Lipase3Glycerol and fatty acids
  • A1 = Nucleotides, 2 = Pepsin, 3 = Lipids
  • B1 = Nucleotides, 2 = Amylase, 3 = Lipids
  • C1 = Amino acids, 2 = Pepsin, 3 = Carbohydrates
  • D1 = Amino acids, 2 = Amylase, 3 = Lipids
  • E1 = Amino acids, 2 = Pepsin, 3 = Lipids


In what organ of the body is the majority of lipase made?

  • ALarge intestine
  • BGallbladder
  • CLiver
  • DPancreas
  • ESmall intestine


Which polymers are formed when monosaccharides, e.g., glucose or fructose, join together via glycosidic bonds?

  • AProteins
  • BGlycerols
  • CLipids
  • DCarbohydrates


The picture provided shows a 3D model of an enzyme.

3D model of an enzyme

What class of biological macromolecule do enzymes belong to?

  • AProteins
  • BNucleic acids
  • CCarbohydrates
  • DLipids

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