BI-673

Digestive enzymes

Biology · Secondary 3 · Easy · Digestive enzymes

In an investigation, starch solution and amylase are mixed at pH 7 and kept at 37°C. Iodine solution is added to a drop of the mixture every minute. At which time is the reaction complete?

When the iodine remains brown for the first time
When the iodine is darkest blue-black
When the iodine turns pale yellow
When the iodine changes from brown to red

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