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In every gene, a sequence of three nucleotide bases will code for an amino acids, many of which form a protein. Within the normal gene for haemoglobin, the sequence of bases will code to produce amino aci...

Paper 1 is a source-based paper split into four questions. Each question requires a different technique in order to gain top marks.

Question 1 is split into two parts, both parts are testing your b...

The loss of coral reefs and mangrove systems would have a major socio-economic impacts. Firstly, without coral reefs and mangrove systems, the nearby coastline would experience an increasing vulnerability...

The easiest structure for you as a student and for the examiner is to separate origins, purpose, values and limitation into four separate paragraphs. Even if one or two of your paragraphs is only a senten...

SSRIs or selective serotonin reuptake inhibitors can be used to treat depression. They are used as they inhibit the reuptake of the neurotransmitter, serotonin, in the presynaptic cell. This increases the...