Which starch is being broken down by an enzyme, Biology

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In an investigation to compare the rates at which starch is being broken down by an enzyme

(a) what test is used

(b) how do you know when the reaction is completed?

a) The test for starch is iodine solution, which goes blue.

b) When no blue colour appears after adding iodine, all the starch has gone and the reaction is complete.

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