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There are two main parts to the synoptic essay, the subject/specification content which will probably make up around 80-90% of your essay, and then the extra content, which is composed of things above the...

Similarities

1. Both have 5 Carbon sugar - pentose

2. Both contain a phosphate

3. Both contain adenine

Differences

1. DNA has a...

Active immunity occurs when an individual develops immunity against a specific antigen when they are exposed to it - your body reacts by producing memory cells that provide long lasting immunity against t...

An antigen is a substance that is introduced to the body and stimulates an immune response and the production of antibodies. Antibodies are proteins produced by cells in the body in in repsonse to the pre...

1. The action potential in the pre-synaptic neurone causes calcium ion channels to open

2. This causes calcium ions to diffuse into the neurone, down its concentration gradient

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