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Capital expenditure appraisal is the evaluation of investment opportunities. 

1. Payback method = The payback method involves calculating the payback per...

The fluid mosaic model describes the composition and function of cell membranes.  Membranes are made of lipids and proteins (and a few other bits and bobs but don’t worry about that here).  The lipids ...

A gene is a segment of DNA that carries the instructions for a specific trait, such as eye colour or how well you can digest food.  When DNA is damaged or is copied incorrectly this changes the gene an...

Ionic bonds exist between metals and non metals for example sodium and chlorine. Metals have one to three electrons in their outer shell which can be transferred to a non metal. This means that the metal ...

Saltatory conduction refers to the passage of an action potential along a myelinated neurone. Myelin is a lipid that forms a fatty sheath around the neurone axon and it is an electrical insulator. This me...