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

Mode of action of enzymes — practice question

A solution of amylase was added to a suspension of starch. The mixture was stirred and maintained at $40^\circ\text{C}$ for 45 minutes. Samples were then tested using different reagents. What set of results would be expected?

  • Aiodine test: black; Benedict’s test: blue; biuret test: blue
  • Biodine test: black; Benedict’s test: orange; biuret test: purple
  • Ciodine test: brown; Benedict’s test: blue; biuret test: blue
  • Diodine test: brown; Benedict’s test: orange; biuret test: purple

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