O-LevelBiologyEnzymes5090/11 · May/June 2022 · Q61 Mark
A dilute starch solution turns blue when very dilute iodine solution is added. This colour disappears as the starch is broken down by amylase. The graph shows the disappearance of the blue colour at different temperatures. [Figure 6.1] Which statement explains the shape of the curve?
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AEnzyme activity rises as the temperature rises.
BEnzymes have an optimum temperature range for activity.
CEnzymes are inactive below 30 °C.
DEnzymes do not work above 30 °C.
✓ Correct answer
B: Enzymes have an optimum temperature range for activity.
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