Unit 5 · Enzymes

Question Bank

Cambridge IGCSE Biology 0610 · 56 questions

Q40Enzymes

In the starch-amylase test, what shows the starch has all been digested?

(a)Iodine turns blue-black

(b)Iodine stays orange-brown

(c)Solution turns brick red

(d)Solution turns purple

Correct answer: (b) Iodine stays orange-brown

Explanation: No starch remains, so iodine stays its original orange-brown colour.

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