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CAIE IGCSE Biology 7.4.3 Digestive Enzymes, Substrates & Products

Practise matching amylase, proteases and lipase to starch, protein and fats or oils, then state the correct soluble sugars, amino acids, fatty acids and glycerol produced.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • state that amylase breaks starch down into simple reducing sugars such as maltose
  • state that proteases hydrolyse proteins into their amino-acid products
  • state that lipase breaks fats and oils down into fatty acids and glycerol

7.4.3—Functions of enzymes as follows: (a) question 1

[Maximum number: 1]

Tissue plasminogen activators (TPAs) are human proteins that are used as drugs to break down blood clots.

TPAs break down blood clots by activating plasminogen. Plasminogen is a protein that is always present in the blood.

When activated, plasminogen forms a protease that breaks down fibrin molecules.

State the products of the action of protease on the protein fibrin.

TPAs can be produced by genetically-engineered bacteria.
Fig. 5.1 shows some of the stages involved in genetically engineering a bacterium to make a TPA.

Fig. 5.1

Fig. 5.1

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