Biology 9700 · AS & A Level · Testing for biological molecules

Testing for biological molecules — practice question

Steps 1-4 are carried out to test for a non-reducing sugar. 1 Place $5\,\text{cm}^3$ of solution in a test-tube. 2 Add several drops of acid. 3 Neutralise using alkali. 4 Add $6\,\text{cm}^3$ of Benedict’s solution. At what point is the solution boiled?

  • Abetween steps 1 and 2
  • Bbetween steps 2 and 3 and after step 4
  • Cbetween steps 2 and 3 only
  • Dafter step 4 only

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