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5.1 Health and communicable disease

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Question 5

A food-testing laboratory grows 600 colonies of bacteria that cause salmonellosis from samples collected before a hygiene programme. The programme has a target of reducing the number of colonies by 70%.

What is the number of colonies that would show the target has been met exactly?

[1]
A

180 colonies

B

353 colonies

C

530 colonies

D

420 colonies

Markscheme

5.1 Health and communicable disease Questions

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

112 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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