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An enzyme is a biological catalyst (something that speeds up a chemical reaction), which is a protein, a chain made of many amino acid molecules. An enzyme has its own unique three-dimensional structure, ...

Diffusion is the movement of particles from a high concentration to a low concentration. This process does not require energy. An...

DNA is a polymer made up from monomer units. The monomers that make up a DNA molecule are called nucleotides. Nuceleotides are made up of a nucelic acid (adenine/guanine/thymine/cytosol); a five carbon...

Enzymes only have one active site which is only complementary to one specific substrate. 

Conveniently, there are roughly 6 main stages in the process of eutrophication, so if you can memorise each one, step by step, you are sure to scoring full marks!

1) Algae blooms block li...