Why does a vaccination give long-term protection?
Answer and explanation
Correct answer: C. It exposes the immune system to an antigen
- Step 1: A vaccine contains a harmless form of an antigen. Step 2. The body makes antibodies and memory cells, giving active immunity that responds quickly to the real pathogen. Answer: memory cells form. Why not the others: ready-made antibodies give passive, short-term protection, and vaccines do not change DNA.
Practise more Cells, Genetics, Ecology and Human Biology.
Free questions with an explanation for every one, and full timed Leaving Cert Ireland mock tests.
More Cells, Genetics, Ecology and Human Biology questions
- Which organelle is the main site of aerobic respiration in an animal cell?
- What is an enzyme?
- How many cells result from one complete round of mitosis in a diploid cell?
- What is osmosis?
- Which tissue carries water and minerals upwards from the roots to the leaves of a plant?
- Which blood cells carry oxygen from the lungs to the tissues?