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GCSE Biology · key term
A single-celled prokaryotic microorganism; some bacteria cause disease.
Used by Edexcel and OCR
Specification 5.4, 5.5, 5.16 · Paper 1
A single-celled microorganism; some bacteria cause disease, although many are harmless or useful.
A type of single-celled microorganism; some bacteria are pathogens that cause disease.
A single-celled microorganism with cellular structures and processes that can be targeted by antibiotics.
Specification B6.3f · Paper 2 (Foundation), Paper 4 (Higher)
A single-celled prokaryotic organism; some species cause disease.
Revise: Common infectionsAnother example of an STI is gonorrhoea, which is caused by a bacterium.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: Plant DiseasesThe pathogen and the symptom are not the same thing: a virus, fungus or bacterium is a cause, whereas mottled leaves or swollen tissue are effects of infection.
Do not say that every bacterium, fungus or protist causes disease; many are harmless or beneficial.
Do not describe a stomach ulcer itself as a pathogen. The pathogen is a Helicobacter bacterium; the ulcer is damage associated with the infection.
Remember the three specified plant pairings: TMV—virus; barley powdery mildew—fungus; crown gall—bacterium.
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