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Explain what causes the conduction of impulses along a non-myelinated axon to be slower than along a myelinated axon.

In myelinated axons, the myelin sheath that surround the membrane prevents action potentials forming, hence depolarisation only occurs at the nodes of Ranvier (breaks in the sheath, exposing the membrane, at...
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Answered by Ruby O. • Biology tutor
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Can you explain the difference between saturated and unsaturated fatty acids?

The key distinguishing feature between saturated and unsaturated fatty acids is the presence of a double bond. This double bond, present only in unsaturated fatty acids, will mean there are less hydrogen ato...
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Answered by Brendan M. • Biology tutor
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Formation of phosphodiester bond

(Answer supplemented with whiteboard annotations) As previously mentioned at GCSE, the sugarphosphate backbone is formed by a condensation reaction between the phosphate group of one DNA molecule and the deo...
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Answered by Mizanur R. • Biology tutor
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What’s the difference between a prokaryotic and a eukaryotic cell?

This is a topic which is common across all A-Level specifications, the questions surrounding this topic may vary from labelling diagrams, matching features in a table, or longer written styles of question (l...
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Answered by Zachary M. • Biology tutor
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Describe the properties of primary protein structure.

The main component of primary protein structure is that it is composed of amino acids. The amino acids are connected via covalent chemical bonds more specifically called the peptide bond. Amino acids joined ...
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Answered by Alysha V. • Biology tutor
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