OCR A Level Biology A
OCR A Level Biology A Communicable Diseases, Disease Prevention and the Immune System Exam Questions
Free OCR A Level Biology A exam questions on Communicable Diseases, Disease Prevention and the Immune System, with mark schemes. Covers pathogens, plant and animal defences, the immune response, vaccination and antibiotics.
Communicable Diseases, Disease Prevention and the Immune System 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.
StemUp mark scheme flashcards
OCR A Level Biology A H420 Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About OCR A Level Biology A Communicable Diseases, Disease Prevention and the Immune System
This topic covers infection and immunity.
What you need to know
- Pathogens Bacteria, viruses, fungi and protoctista, and their transmission.
- Defences Primary non-specific defences in plants and animals.
- Immune response Phagocytes, T and B lymphocytes, antibodies and memory cells.
- Immunity Active and passive immunity, vaccination and antibiotic resistance.
Common mistakes in Communicable Diseases, Disease Prevention and the Immune System
- Confusing antigen and antibody.
- Saying antibiotics kill viruses.
- Mixing active and passive immunity.
Try three Communicable Diseases, Disease Prevention and the Immune System exam-style questions
1. Describe the structure of an antibody. (2 marks)
Show the mark scheme answer
Four polypeptide chains, two heavy and two light (1), with variable regions forming antigen binding sites (1).
2. Explain why the secondary response is faster. (1 mark)
Show the mark scheme answer
Memory cells recognise the antigen and divide rapidly.
3. Give one example of passive immunity. (1 mark)
Show the mark scheme answer
Antibodies passed across the placenta or in breast milk.
Communicable Diseases, Disease Prevention and the Immune System FAQs
What does this topic cover?
Pathogens, defences, the immune system, vaccines and antibiotics.
Which practical links here?
Aseptic technique and testing antimicrobial effects.
What is herd immunity?
When enough people are immune that the pathogen cannot spread easily.
Revise this topic with flashcards: OCR A Level Biology A H420 Flashcards, with mark scheme answers for Anki and Quizlet.
