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Explain the transmission of a nerve impulse across a cholinergic synapse referring to action potentials. (6)

When an action potential reaches the terminal of a pre-synaptic cleft, voltage-gated calcium channels are stimulated to open, causing an influx of Ca+ ions in the pre-synaptic neuron. This infux of Ca+ ions ...
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Answered by Sarah W. • Biology tutor
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A.C Bradley presented an analysis of Othello as 'the most romantic figure among Shakespeare's heroes...(he) does not belong to our world'. To what extent do you agree with this view? Comment on Shakespeare's dramatic methods.

Introduction - Establish an opinion on the quotes/ Establish the two key sides of the argument. In this case the presentation of Othello as a figure who conforms to the classical Aristotle form of tragedy (t...
ER
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Explain one push factor for economic migration [4]

The main reason why economic migrants move away from their country of origin is down to opportunity's and employment. Often those who move are unemployed and struggling to find work in their own country due ...
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Answered by Zara M. • Geography tutor
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Why does a base substitution in DNA not always result in the formation of non-functional proteins?

Protein structure is determined by amino acid sequence. Each amino acid is coded for by a triplet of RNA bases. These are transcribed from a DNA molecule. If a DNA base is substituted for another base, then ...
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Answered by Abby R. • Biology tutor
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outline the characteristics of the globalisation of culture

Culture refers to the norms, values and customs that help make 'the way of life' of a particular society. Commentators have dubbed this culture to operate on a global level. One characteristic of the globali...
YM
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