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5.1 Health and communicable disease

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Question 23
H

Scientists compare two groups exposed to tuberculosis bacteria. The groups are similar in age and exposure.

Table

GroupHIV statusPeople exposedPeople developing tuberculosis
PHIV positive20060
QHIV negative30030

Which statement correctly compares the risks and gives a biological explanation?

[1]
A

risk is twice as high in P because HIV damages lung tissue directly

B

risk is twice as high in P because HIV produces tuberculosis bacteria

C

risk is three times as high in P because HIV increases airborne transmission

D

risk is three times as high in P because HIV destroys white blood cells

Markscheme

5.1 Health and communicable disease Questions

  1. GCSE
  2. /Biology
  3. /5.1 Health and communicable disease

43 exam-style questions on Edexcel GCSE Biology 5.1 Health and communicable disease, covering 5.1.1 Communicable and non-communicable diseases, 5.1.2 Disease susceptibility interactions, 5.1.3 Pathogens as disease-causing organisms, 5.1.4 Common infections, 5.1.5 Spread and prevention of pathogens, 5.1.6 Lifecycle of a virus, and 5.1.7 Spread and prevention of STIs. Each one has a worked solution and a mark scheme showing where the marks go.

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