Tests for biological molecules
I can carry out tests for biological molecules, including sugars, starch, proteins and lipids.
Tests for biological molecules
I can carry out tests for biological molecules, including sugars, starch, proteins and lipids.
Lesson details
Key learning points
- A reagent called Benedict’s solution is used to test for reducing sugars, including glucose.
- A reagent called iodine solution is used to test for starch, a type of carbohydrate.
- A reagent called Biuret solution is used to test for protein.
- Ethanol (a type of alcohol) is used to test for lipids.
- Interpretation of qualitative food test results.
Common misconception
Mistakes on method, results confusion, and poor descriptions using inaccurate terminology.
Methods and results are described, demonstrated and tested throughout, and methods tried by students with results gathered and analysed. Repeated review of results occurs throughout the lesson, and methods and results are applied to novel questions.
Keywords
Reagent - A chemical used to test for a type of biological molecule.
Qualitative - A test in which the result is based on an observation.
Quantitative - A test in which a measurement produces numerical data.
Equipment
Distilled water, Benedict's solution, Biuret's solution, Sodium Hydroxide, Iodine solution, Ethanol, test/boiling tubes, bung, pipettes, 60 degree water bath, safety goggles.
Content guidance
- Equipment requiring safe usage.
Supervision
Adult supervision recommended.
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Video
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Starter quiz
6 Questions
amino acids
sugar
Exit quiz
6 Questions
starch
reducing sugar
protein
