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What is the fluid mosaic model?

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...
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Answered by Nick O. • Biology tutor
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How do genes affect illness?

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...
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Answered by Nick O. • Biology tutor
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The UKCAT test has a lot of questions and not very long to complete them. How can I make sure I get through them all in the time allowed?

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 the UKC...
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Answered by Nick O. • UCAT tutor
2137 Views

How does ionic bonding work and what is the structure of an ionic compound?

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 now...
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What is meant by the phrase saltatory conduction?

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...
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