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1. action potential arrives at post synaptic terminal 2. voltage gated calcium channels open 3. calcium enters presynaptic neuron and move to neurotransmitter vesicles 4. vesicles move to membranes and...

Note that the question is 3 marks. Also note the question uses the word 'contrast' so you must talk about both processes. Cells must communicate with their external environment and vice versa, therefore, ...

Constriction of blood vessels Dilation of pupils Slows down digestion

In the population of a species there will always be a selection pressure (new predator/competitor/ presence of disease) There is genetic variation within the population so new alleles can arise due to ran...

DNA replication is called semi-conservative, because each original strand is used to create a new strand. In order to do this, first we need to separate the two strands: they are unwound and unzipped by t...