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Explain how during the light independent reaction of photosynthesis carbon dioxide is converted to organic substances.

Questions involving processes in respiration and photosynthesis usually give high marks in the Biology A level AQA unit 4 papers. By understanding and learning key parts of the processes, you can ensure your...
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Answered by Natalie C. • Biology tutor
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Describe the process of synaptic neurotransmission

Neurotransmission is a mechanism of propagating an electrical signal between neurons via the movement of charged particles. It is initiated when the arrival of an action potential at the axon terminal trigge...
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Answered by Betsy H. • Biology tutor
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What is the best method for Biology A level revision?

As an A* biology student, I believe I can help show others the best way to revise for biology and receive the grade they want. Firstly, acquire a text book that you know contains all the information from you...
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Answered by Orla B. • Biology tutor
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Explain how nerve transmission occurs at the synapse.

As an action potential arrives at the presynaptic knob, the membrane is depolarised. This causes calcium channels in the membrane to open and calcium ions to flood in. This influx of calcium causes vesicles ...
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Answered by Abigail H. • Biology tutor
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What is the process of saltatory conduction and why is it important in the human nerve system?

Many (Not all) neurons are myelinated by schwann cells. The myelination covers the neuron with a fatty layer with small gaps between each schwann cells. These small gaps are called nodes of ranvier. When an ...
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Answered by Han Y. • Biology tutor
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