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Explain the Theory of Natural Selection

There are four key points to natural selection: first, that individuals in all species show variation second, that this variation is genetic and therefore heritable third, that certain characteristics give t...
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Answered by Josie W. • 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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Why does a mutation in the genetic code change the structure of a haemoglobin molecule?

The mutation alters the base sequence which therefore changes the sequence of Amino Acids coded for (the primary structure). Now the sequence of Amino Acids has been changed when bonds form and folding occur...
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Answered by Harry M. • 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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What are the differences in the structures of arteries and veins?

Arteries have a much narrower lumen (the middle bit of space) and a much thicker wall. This is due to the fact that arterial walls contain more muscle and elastic fibres, than those of veins. Reason: Arterie...
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Answered by Matilda C. • Biology tutor
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