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6.3 Monitoring and maintaining health

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Question 10
F

A student wants to find out which of three antiseptics, A, B and C, is best at killing bacteria.

The student is given:

  • a Petri dish containing sterile nutrient agar
  • a culture of bacteria in a bottle of broth
  • a sterile pipette and a sterile spreader
  • four paper discs: one soaked in each antiseptic and one soaked in sterile water
  • forceps, a Bunsen burner, alcohol, a ruler and sticky tape.

Describe how the student should carry out the investigation, using aseptic techniques, and how the student should compare the antiseptics.

[6]
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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