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Cambridge AS & A Level Biology

2.1Testing for biological molecules

Testing for biological molecules in Cambridge AS & A Level Biology: what the syllabus expects you to know, the learning objectives and how to practise.
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Learning objectives

What the syllabus expects you to be able to do.

  1. 2.1.1Describe and carry out the Benedict's, iodine, emulsion and biuret tests.
  2. 2.1.2Carry out a standardised semi-quantitative Benedict's test to estimate the concentration of a reducing sugar.
  3. 2.1.3Test for non-reducing sugars using acid hydrolysis and Benedict's solution.

Lessons

  • Tests for biological molecules

    35 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Testing for biological molecules: sample question

1 mark

A solution of sucrose is tested with Benedict's solution and heated. What is the result, and why?

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