Topic Four (1.4): Biological Molecules

To begin this topic, you need to list the elements contained in the biological molecules: carbohydrates, fats, and proteins. You must be able to recall how the smaller units build up to form these molecules. You may find it useful to make a table that includes all this information for your revision.

You need to be able to describe specific biochemical tests and the results you would expect for a positive and negative result.

The last area focuses on how proteins have a specific shape. This is due to the specific sequence of the amino acids. This understanding will be essential for enzymes.

 Reading

Please read through and make notes on pages 21-27 in the textbook. Complete the in-text questions and check your answers.

 Download

Download and read through the PowerPoint Food Types, Deficiencies and Food Tests Download Food Types, Deficiencies and Food Tests

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 Link

WATCH - Amoeba Sisters: Biomolecules (YouTube) Links to an external site.

 Skills

Biochemical Tests. You will need to be able to describe and explain the following biochemical tests: Iodine Test (starch), Benedict’s Test (reducing sugars), Biuret test (protein) and Ethanol Test (fats).