Vaccination — AQA GCSE Biology
Test yourself on Vaccination with AQA GCSE practice questions.
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Vaccination explained
Vaccination introduces a small quantity of dead or inactive pathogen, or antigens from it, into the body.
Read the full explanation
Because the pathogen is dead or inactive, it cannot cause the disease, but its antigens are still recognised as foreign. White blood cells called lymphocytes respond by producing antibodies that are specific to those antigens. The person also produces memory cells. If the live pathogen later enters the body, the memory cells recognise the same antigens and trigger a faster, larger antibody response. The pathogen is destroyed before it can cause illness, so the person is immune. For example, the MMR vaccine contains weakened measles, mumps and rubella viruses, stimulating antibodies without causing the diseases.
Your focus
- Describe what a vaccine contains and why it does not cause disease.
- Explain how vaccination stimulates white blood cells to produce antibodies.
- Explain how memory cells provide immunity after vaccination.
Vaccination exam tips
Marking Points
- Vaccination introduces a small quantity of dead or inactive pathogen, or antigens, into the body.
- The pathogen in the vaccine is dead or inactive, so it does not cause the disease.
- White blood cells, specifically lymphocytes, are stimulated to produce antibodies.
- The antibodies produced are specific to the antigens on the pathogen in the vaccine.
- Memory cells are produced, so a later infection with the live pathogen triggers a faster antibody response.
- The person becomes immune to that pathogen without having suffered the disease.
Examiner Tips
- 💡State that the pathogen is dead or inactive so it cannot cause disease, then explain how antibodies are produced.
- 💡Use the term memory cells when explaining how vaccination gives long-term protection.
- 💡Link the antigens in the vaccine to the specific antibodies produced, showing that the response is specific.
Common Mistakes
- Saying the vaccine contains antibodies; correction: the vaccine contains dead or inactive pathogen or antigens, and the body produces its own antibodies.
- Thinking the vaccine directly kills the pathogen; correction: the vaccine stimulates white blood cells to produce antibodies and memory cells, which provide protection on later infection.
- Believing any pathogen can be used in any vaccine; correction: the pathogen or antigens in a vaccine must match the specific pathogen being protected against.