HIV (Human Immunodeficiency Virus) is a communicable viral disease. How is the HIV virus primarily transmitted from one person to another? Select one option:
The table below shows the annual number of new HIV diagnoses recorded in a specific urban clinic.
| Year | Number of new HIV diagnoses |
|---|---|
| 2014 | 1200 |
| 2017 | 1550 |
| 2020 | 450 |
Describe what happened to the number of new HIV diagnoses from 2014 to 2020.
What could cause a significant decrease in the number of new HIV transmissions in the future? Select one option:
Vaccines can be developed to prevent the spread of viral pathogens. The statements below outline the sequential stages of how a vaccine stimulates active immunity in a person.
Write the stages A, B, C, and D in the correct sequence to show how vaccination works. The first stage has been completed for you:
C→‾→‾→‾ \text{C} \rightarrow \underline{\quad\quad} \rightarrow \underline{\quad\quad} \rightarrow \underline{\quad\quad} C→→→Before any new antiviral drug or vaccine is approved for clinical trials on humans, it must undergo preclinical testing. After testing on laboratory-grown human cells and tissues is complete, what is the next stage of preclinical testing? Select one option:
Many modern drugs are synthesized by chemists but were originally discovered in plants or microorganisms. Match each medicine to the correct source from which it was originally derived:
Sources:
25 exam-style questions on AQA GCSE Biology 3.1 Communicable diseases, covering 3.1.1 Communicable (infectious) diseases, 3.1.2 Viral diseases, 3.1.3 Bacterial diseases, 3.1.4 Fungal diseases, 3.1.5 Protist diseases, 3.1.6 Human defence systems, 3.1.7 Vaccination, 3.1.8 Antibiotics and painkillers, and 3.1.9 Discovery and development of drugs. Each one has a worked solution and a mark scheme showing where the marks go.