1.4 understand the term pathogen and know that pathogens may include fungi, bacteria, protoctists or viruses

Fungi, bacteria, protoctists and viruses can all cause disease. Therefore they are pathogenic.

1.3 describe the common features shown by prokaryotic organisms such as bacteria

Prokaryotic: organisms lacking a nucleus

Bacteria:
- unicellular
- lack in nuclei so has plasmids (circular chromosome of DNA)
- has cell wall
- some carry out photosynthesis
- eat dead/living organisms
- e.g. lactobacillus bulgaricus, pneumococcus



Virus:
- small particles
- parasitic, can only reproduce in living cells.
- infect every type of organism
e.g. influenza which causes flu, HIV which causes AIDS.