Looking at the basic structure and function of the nucleic acids.  Also covers the basics of DNA replication.  A good point to kick off your revision.

In this podcast we look at the structure and function of carbohydrates.  This includes consideration of the mono, di and polysaccharides.  Details of glycosidic bonds and their formation and breakage during condensation are also included.  Basically all you need to know for As level biology.

Here we consider the structure of porteins from the basic of amino acids to the primary, secondary, tertiary and quaternary levels of structure.  The concept of hydrolysis and condensation again appear.

Lipids, this podcast looks at the structure and function of triglycerides and also covers some basic details of the phospholipids.  We look at the formation of triglycerides through the formationof ester bonds – another example of a condensation reaction in biomolecules.