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There are two situations when you can use an apostrophe:  contractions and for possession.  I will start with contractions as this is the easiest.

A contraction is when you...

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...

Time pressure is one of the hardest aspects of the UKCAT but luckily it is an aspect that you can train for.  Practicing questions under time pressure is very important.  Questions can be obtained from...

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 ...