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When a Metal and acid react together they form a salt, and hydrogen gas. You can't really see the salt when is is formed, as salts dissolve in solution. However you can see the hydrogen gas bubbles. So fi...

Essay Plan-Firstly, introduce the answer by giving an overview of the arms race. It began with the USSR successfully testing an atomic bomb in 1949 and was a key feature of the struggle for supremacy thro...

mRNA serves as the template from which the tRNA will join to, during the process of translation, to form the polypeptide chain and eventually the protein. if the template is wrong or missing the desired p...

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, ...