Diseases and Immunity

Worked examples (12)extended set

• 1Pathogens and transmissible diseases: the key definitions
• 2Sorting direct and indirect transmission
• 3Which defence stops the pathogen?
• 4Matching defences to their actions (multiple choice)
• 5Cholera cases after clean water and sewage treatment
• 6Why cooked rice should not be left out: bacterial growth
• 7Pathogens in blood: reducing the risk in a hospital
• 8Testing hand-washing methods on agar plates
• 9Tracking an outbreak to its source
• 10Rubbish, flies and rats: waste disposal and sewage
• 11Stomach acid and the survival of bacteria
• 12Comparing villages: which measure controls disease best?

Model answers (6)

• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 structured style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 4 (Extended) extended-response style

Worked examples (12)extended set

• 1Matching the immunity key terms
• 2Which antibody fits? Antigen and antibody shapes
• 3Immunity in a breast-fed baby (multiple choice)
• 4Antibody levels after a first and second vaccine dose
• 5Completing a vaccination flow chart
• 6Vaccination coverage and measles cases
• 7Active or passive? Comparing the two types of immunity
• 8How the cholera toxin causes dehydration
• 9Which arrows show the effect of the cholera toxin? (multiple choice)
• 10Calculating fluid and salt loss in cholera
• 11Lymphocytes and phagocytes on a blood drawing
• 12Why a new flu vaccine is needed, and when antibodies are injected

Model answers (6)

• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 structured style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 4 (Extended) extended-response style