Biology 9700 · AS & A Level · Mode of action of enzymes

Mode of action of enzymes — practice question

A solution of amylase was mixed with a starch suspension. After 30 seconds, three samples of the mixture were tested using iodine solution, Benedict’s solution and biuret reagent. Which results would be expected?

  • Aiodine solution: black; Benedict’s solution: green; biuret reagent: purple
  • Biodine solution: black; Benedict’s solution: red; biuret reagent: blue
  • Ciodine solution: brown; Benedict’s solution: blue; biuret reagent: purple
  • Diodine solution: brown; Benedict’s solution: yellow; biuret reagent: blue

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