BI-677
Digestive enzymes
Biology · Secondary 3 · Medium · Digestive enzymes
In an experiment, starch solution and amylase are placed inside Visking tubing and the tubing is immersed in a beaker of water at 37°C. After 20 minutes, the water outside the tubing is tested.
Which result shows that amylase has acted on the starch?
Which result shows that amylase has acted on the starch?
- Iodine turns blue‑black; Benedict’s test stays blue
- Iodine stays brown; Benedict’s test turns brick‑red
- Both iodine and Benedict’s tests stay their original colours
- Iodine turns blue‑black; Benedict’s test turns brick‑red
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