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2.2 Animal tissues, organs and organ systems

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Question 13

Scientists exposed groups of laboratory animals to different daily doses of substance Q. All other conditions were kept the same.

After 12 months, the scientists tested cells from each animal and recorded whether the animals had developed malignant (cancerous) tumours.

Daily dose of substance Q in mg per kg of body massCells with a mutation per 10 000 cellsAnimals that developed a malignant (cancerous) tumour in %
0.062
2.0116
4.01914
8.03528

Explain why these results support the conclusion that substance Q is a carcinogen.

[4]
Markscheme

2.2 Animal tissues, organs and organ systems Questions

  1. GCSE
  2. /Biology
  3. /2.2 Animal tissues, organs and organ systems

304 exam-style questions on AQA GCSE Biology 2.2 Animal tissues, organs and organ systems, covering 2.2.1 The human digestive system, 2.2.2 The heart and blood vessels, 2.2.3 Blood, 2.2.4 Coronary heart disease: a non-communicable disease, 2.2.5 Health issues, 2.2.6 The effect of lifestyle on some non-communicable diseases, and 2.2.7 Cancer. Each one has a worked solution and a mark scheme showing where the marks go.

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