Search over 10,000 free study notes

Firstly, an enzyme is a specific protein with a unique shape. The main aim of an enzyme is to CATALYSE a reaction. This means, the reaction is sped up, but the concentrations of reactants or products are ...

• Vaccines contain dead or inactive forms of a pathogen. - These dead or inactive forms stimulate the white blood cells to produce antibodies against the pathogen. - If a person is infected by the pat...

A synapse is gap between two neurones. When a nerve impulses travels along the axon reaches the end of the pre-synaptic neurone, the release of chemical messengers (called neurotransmitters) is triggered....

Neurones are nerve cells that carry information as tiny electrical signals. There are three different types of neurones, each with a slightly different function: sensory neurones carry signals from recept...

Allopatric speciation occurs when two species are living in separate environments and therefore there is no gene flow between the populations. This will then cause the populations to differentiate (change...