A-LevelBiologyBiological molecules9700/12 · Oct/Nov 2022 · Q61 Mark
The table shows the observations recorded from tests for biological molecules on four samples, A, B, C and D. Which conclusion is correct?
ABenedict's solution: blue, biuret reagent: blue, iodine solution: blue-black, conclusion: contains starch only
BBenedict's solution: blue, biuret reagent: purple, iodine solution: orange, conclusion: contains reducing sugar only
CBenedict's solution: green, biuret reagent: blue, iodine solution: orange, conclusion: contains reducing sugar and protein
DBenedict's solution: red, biuret reagent: blue, iodine solution: blue-black, conclusion: contains starch and protein
✓ Correct answer
A: Benedict's solution: blue, biuret reagent: blue, iodine solution: blue-black, conclusion: contains starch only
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