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In all organisms, allows creation of bigger molecules from smaller ones In animals, enables muscle contraction In some animals (mammals and birds), provides heat to maintain a constant body temperature In pl...

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 and prot...

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 and so th...

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 means...

Within a gene pool of a population, there is genetic variation, due to mutation. This leads to phenotypic variation. Some individuals will be better adapted to the environment than others and will therefore ...