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Enzymes are molecules in the body that break down specific substrates which can then be used for energy or stored. An enzyme contains an active site that is complementary in shape to the substrate being brok...

People are immunised against pathogens through vaccination - usually an injection. A vaccine is comprised of dead , inactive or weakened pathogen or virus. These act as antigens (foreign proteins) that the b...

This question crops up a lot and may be up to a five mark question, if you learn the key points and terms you can be confident of getting all the marks you can here! First of all, an algal bloom occurs which...

An enzyme is a protein that act as a biologcal catalyst, meaning that they will activate a biological reaction. Enzymes are very specific and will work with a specific substrate. You can think of an enzyme a...

The genetic code refers to DNA, which is like a blueprint that can be found in all living organisms. DNA is made up of 4 nucletotides: Adenine (A), Thymine (T), Guanine (G) Cytosine (C), whether in a bacteri...