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Explain the process that occurs from when the action potential reaches the pre-synaptic knob to transmission in the next neurone. (6 Marks)

Once an action potential reaches the synaptic cleft of a pre-synaptic neuron, voltage-gated calcium channels open. It is the depolarisation of the membrane that causes the opening. Calcium ions subsequently ...
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Answered by Basel E. • Biology tutor
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Name 3 differences between a plant cell and an animal cell.

A plant cell contains the following which an animal cell does not :ChloroplastsPermanent vacuole filled with sapCellulose cell wall Animal and plant cells both contain (so cannot be any of the following):Nuc...
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Answered by Kieran G. • Biology tutor
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What is the difference between Tumour supressor genes and Oncogenes?

Tumour supressor genes (TSG) and oncogenes and the two main types of genes involved in cancer, however they are very different. TSG normally function to slow down cell division, repair DNA mistakes and cause...
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Answered by Ella W. • Biology tutor
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Outline the differences between arteries and veins? (6) marks- 3 for each

Arteries and veins are the "tubes" that carry blood around the body.Artieries have thick outer walls in order to cope with the blood passing through being under such high pressure generated by the ...
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Answered by Amber F. • Biology tutor
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What is allopatric speciation?

When two populations of a species are isolated geographically (for example by a river, mountain, flood etc). The two populations adapt to different selection pressures and so then eventually evolve into two ...
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Answered by Isabella P. • Biology tutor
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