AQA GCSE Combined Science: Trilogy Biology Paper 1 (Higher), 2024: Question 3

✅ Correct answer

💡 Key knowledge

• Measles is a viral disease.
• A pathogen can be a virus, bacterium, fungus or protist.
• Here, the correct pathogen type is specifically virus.

❌ Common errors

• Writing bacteria or bacterium.
• Writing just pathogen is too vague here.

✅ Correct answers

Any two from:

• Isolation of people with measles
• Cover your nose / mouth when you cough or sneeze
• Frequent handwashing / use of sanitiser

💡 Key knowledge

• Measles spreads from infected people, so reducing contact and reducing droplet spread helps.
• The mark scheme also allows ideas such as wearing face coverings and frequent cleaning of surfaces.

🧠 Exam technique

• The command word is suggest, so you need sensible practical measures.
• The question says do not refer to vaccination — if you do, that point will not gain credit.
• Keep each answer separate and specific.

❌ Common errors

• Giving vaccination even though the question says not to.
• Writing vague answers like be careful or use PPE without qualification.
• Writing social distancing on its own — the mark scheme says unqualified answers like this are ignored.
• Writing public health campaigns only, without a direct action that reduces spread.

✅ Correct answer

A full-mark answer could be:

💡 Key knowledge

• Vaccine contains dead / inactive / weakened pathogen, or antigens.
• White blood cells produce antibodies.
• These antibodies are specific to measles.
• Memory cells stay in the body.
• On second exposure, antibodies are produced faster and in larger amounts.

🧠 Exam technique

This is a 4-mark “describe” question, so aim for a clear sequence.

1. Say what is in the vaccine.
2. Say that white blood cells produce antibodies.
3. Say the antibodies are specific to measles.
4. Finish with memory cells and the faster response in future.

❌ Common errors

• Saying phagocytes produce antibodies — this is not accepted.
• Not mentioning that antibodies are specific.
• Talking about herd immunity — the mark scheme says ignore this here.
• Talking about antitoxins — not relevant for this answer.
• Saying the vaccine contains dead measles without saying virus/pathogen can be too imprecise; better to say dead/inactive/weakened measles virus.

✅ Correct answer

💡 Key knowledge

• Viruses are not complete cells.
• They reproduce inside host cells.
• Damage to body cells causes the symptoms of illness.

🧠 Exam technique

• For 2 marks, make two linked points.
• Use a cause-and-effect structure: enter cells → cells damaged/killed.

❌ Common errors

• Only saying they make you ill — too vague.
• Describing bacteria instead of viruses.
• Forgetting to mention the effect on the cells.

✅ Correct answers

Any three from:

• To check the drug is not toxic / poisonous
• To check the drug is effective / works / treats the disease
• To determine the correct dosage / how much is needed

💡 Key knowledge

• Clinical trials test safety.
• Clinical trials test efficacy (whether it works).
• Clinical trials help find the optimum dose.
• The mark scheme also allows checking for side-effects or interactions with other drugs.

🧠 Exam technique

• Give three separate reasons, not one long sentence that repeats the same idea.
• The easiest full-mark structure is:
  1. safety
  2. effectiveness
  3. dosage

❌ Common errors

• Repeating the same idea twice, such as safe and not dangerous.
• Giving vague statements like to test it with no detail.
• Missing dosage, which is a very common marking point.

💡 Must-know facts

• Measles is caused by a virus.
• Spread can be reduced by isolation, covering coughs/sneezes, and handwashing.
• Vaccines lead to specific antibodies and memory cells.
• Viruses cause illness by entering cells and damaging/killing them.
• Clinical trials check safety, efficacy, and dosage.

🧠 Final exam advice

• Read instructions carefully — especially when a question says do not include something.
• For 4-mark biology explanations, write in a logical chain.
• Use precise scientific words: antibodies, memory cells, specific, toxic, dosage.
• Short, accurate answers often score better than long vague ones.