Biology

Course summary

The basic principles explored in the A Level biology course can be summaries into the following statements: • All life on Earth exists as cells. • The internal environment of a cell or organism is different from its external environment. • Biodiversity is reflected in the vast number of species of organisms. • Life depends on continuous transfers of energy. • A stimulus is a change in the internal or external environment. • The theory of evolution underpins modern Biology. • Cells are able to control their metabolic activities by regulating the transcription and translation of their genome.