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6.3 Monitoring and maintaining health

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Question 32
H

A paper disc with a diameter of 6 mm is soaked in an antibiotic and placed on agar with bacteria.

After incubation, the clear zone around the disc, including the disc, is a circle with a diameter of 20 mm.

What is the area of clear agar that is not covered by the disc?

Use the equation: area =πr2= \pi r^2=πr2

[1]
A

44.0 mm244.0\ \text{mm}^244.0 mm2

B

285.9 mm2285.9\ \text{mm}^2285.9 mm2

C

314.2 mm2314.2\ \text{mm}^2314.2 mm2

D

1143.5 mm21143.5\ \text{mm}^21143.5 mm2

Markscheme

6.3 Monitoring and maintaining health Questions

  1. GCSE
  2. /Biology
  3. /6.3 Monitoring and maintaining health

181 exam-style questions on OCR GCSE Biology 6.3 Monitoring and maintaining health, covering 6.3.1 Health and disease, 6.3.2 Interactions between diseases, 6.3.3 Spread of communicable diseases, 6.3.4 Common infections and diseases, 6.3.5 Physical plant defence responses, 6.3.6 Chemical plant defence responses, 6.3.7 Detecting and identifying plant diseases, 6.3.8 White blood cells and platelets, 6.3.9 Non-specific defence systems, 6.3.10 The immune system, 6.3.11 Monoclonal antibodies, 6.3.12 Vaccines and medicines, 6.3.13 Aseptic techniques, 6.3.14 Discovery and development of new medicines, 6.3.15 Causes of non-communicable diseases, 6.3.16 Treatments for cardiovascular disease, 6.3.17 Lifestyle factors and non-communicable diseases, 6.3.18 Cancer, 6.3.19 Stem cells in medicine, 6.3.20 Gene technology in medicine, and 6.3.21 The human genome and medicine. Each one has a worked solution and a mark scheme showing where the marks go.

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