O-LevelBiologyEnzymes5090/11 · May/June 2010 · Q41 Mark
Cubes of hard-boiled egg white are placed in test-tubes containing 5 cm³ of water. Other substances are added to each tube as shown in the chart. The tubes are left for eight hours and then tested for amino acids. Which tubes show that pepsin is an enzyme? [Figure 4.1]
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A1 and 6
B2 and 7
C4 and 5
D5 and 6
✓ Correct answer
C: 4 and 5
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