, Characteristics of life: Organisms…
• consist of cells
• grow & develop
• regulate their own metabolic processes
• react to stimuli
• reproduce
• & populations adapt to their environments
, Levels of biological organisation
• Subatomic particles
• Atoms
• Molecules
• Organelles
• Cell
• Tissue
• Organ
• System
• Organism
, Organic compounds
• Generally have their origin in living organisms
• Contain large numbers of carbon atoms (C)
together with other atoms e.g. H, O, N & P
• Are usually large & complex molecules
• Are combustible in oxygen to form, among
other things, CO2