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-Spatial summation occurs when multiple presynaptic neurones together release enough neurotransmitter (e.g. acetylcholine) to exceed the threshold of the postsynaptic neurone. For example, neurone A and neur...

Sence codons are used for synthesizing mRNA and are generated as complementary strand during DNA semi-conservative replication while Antisense codons are the template used for DNA replication and can't be us...

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...