plumiHow TB and HIV cause disease: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 6.2.2 How TB and HIV cause disease, 2019–2025, with mark schemes and examiner’s reports where available.
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Q5(a)
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All 16 questions on How TB and HIV cause disease, as a list
- January 2024, Unit 4, Q5(a) (4 marks): Explain why HIV infection causes tuberculosis (TB) to be worse. (4)
- January 2024, Unit 4, Q5(b)(i) (2 marks): Suggest two reasons why these figures are only estimates. (2)
- January 2024, Unit 4, Q5(b)(ii) (1 mark): Calculate the number of people with both infections. Give your answer in standard form. (1) Answer
- January 2024, Unit 4, Q5(c)(i) (2 marks): Comment on the relationship between the number of people who have TB and the percentage of people who have HIV. (2)
- January 2024, Unit 4, Q5(c)(ii) (3 marks): Describe how the strength of the relationship between the number of people who have TB and the percentage of people who have HIV could be determined. (3)
- January 2023, Unit 4, Q9(a) (1 mark): In 2019, an estimated 1.2 million children, 3.2 million women and 5.6 million men developed TB. Calculate the ratio of children to women to men who developed TB
- January 2023, Unit 4, Q9(b) (3 marks): Explain how infection with Mycobacterium tuberculosis may result in death. (3)
- June 2022, Unit 4, Q6(b)(iii) (2 marks): Explain why the number of people infected with HIV is going up although the number of new infections and deaths is going down, after 2005. (2)
- January 2022, Unit 4, Q3(a) (4 marks): Explain why the virus is an immunodeficiency virus. (4)
- January 2022, Unit 4, Q3(b)(i) (2 marks): Explain how these two drugs reduce the development of HIV. (2)
- January 2022, Unit 4, Q3(b)(ii) (2 marks): These two drugs are often given in combination with other antiretroviral drugs. Suggest why patients are given combinations of drugs. (2)
- January 2022, Unit 4, Q3(b)(iii) (2 marks): If a patient stops taking the antiretroviral drugs, the number of virus particles increases again. Suggest why this increase occurs. (2)
- June 2021, Unit 4, Q8(a)(i) (2 marks): This patient was given a combination of antibiotics for several months. Explain why a combination of antibiotics had to be given for several months. (2)
- June 2021, Unit 4, Q8(a)(ii) (3 marks): This patient did not respond to the combination of antibiotics, and later needed a lung transplant. Suggest why this patient needed a lung transplant. (3)
- October 2020, Unit 4, Q4(b)(iii) (4 marks): Patients being treated with antibodies to TNF are more susceptible to tuberculosis (TB), which can be fatal. Explain why patients being treated with antibodies
- January 2020, Unit 4, Q5(a)(ii) (2 marks): The glycoproteins (2)
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