OCR A Level Biology B (Advancing Biology)
OCR A Level Biology B (Advancing Biology) Pathogenic Microorganisms Exam Questions
Free OCR A Level Biology B (Advancing Biology) exam questions on Pathogenic Microorganisms, with mark schemes. Covers bacteria, viruses, fungi and protoctista as pathogens, transmission and culturing.
Pathogenic Microorganisms exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
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A Level Biology Flashcards
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Pick your exam board, then test yourself with the questions on this page.
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About OCR A Level Biology B (Advancing Biology) Pathogenic Microorganisms
This topic covers disease-causing microorganisms.
What you need to know
- Pathogen types Bacteria, viruses, fungi and protoctista with examples.
- Transmission Direct and indirect routes.
- Culturing Aseptic technique and serial dilution.
- Bacterial growth Counting colonies and growth curves.
Common mistakes in Pathogenic Microorganisms
- Calling viruses cells.
- Poor aseptic technique descriptions.
- Forgetting to multiply by the dilution factor.
Try three Pathogenic Microorganisms exam-style questions
1. Give one example of a disease caused by a protoctist. (1 mark)
Show the mark scheme answer
Malaria.
2. Explain why agar plates are taped but not sealed. (1 mark)
Show the mark scheme answer
To prevent anaerobic pathogens growing.
3. A 10⁻⁴ dilution gives 35 colonies from 0.1 cm³. Find cells per cm³. (1 mark)
Show the mark scheme answer
3.5 x 10⁶.
Pathogenic Microorganisms FAQs
What does this topic cover?
Pathogens, transmission and culturing microorganisms.
Which practical links here?
Aseptic technique and serial dilution.
Why incubate at 25 °C?
To reduce the risk of growing human pathogens.
Revise this topic with flashcards: A Level Biology Flashcards, with mark scheme answers for Anki and Quizlet.
