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1.1 Cell structure

1.1 Cell structure

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Question 26
H

A wound is contaminated with 5.0 × 102 bacteria of one species. Inside the body the mean division time of this species is 40 minutes.

Symptoms of infection appear once the number of bacteria in the wound reaches 1.0 × 106 .

a.

Calculate the smallest number of divisions needed for symptoms of infection to appear.

[2]
b.

Calculate the time taken for symptoms of infection to appear. Give your answer in hours and minutes.

[1]
c.

The wound is cooled so that it stays at 30 degrees Celsius instead of 37 degrees Celsius.

Suggest the effect this has on the time taken for symptoms to appear. Give a reason for your answer.

[2]
Markscheme

1.1 Cell structure Questions

  1. GCSE
  2. /Biology
  3. /1.1 Cell structure

163 exam-style questions on AQA GCSE Biology 1.1 Cell structure, covering 1.1.1 Eukaryotes and prokaryotes, 1.1.2 Animal and plant cells, 1.1.3 Cell specialisation, 1.1.4 Cell differentiation, 1.1.5 Microscopy, and 1.1.6 Culturing microorganisms. Each one has a worked solution and a mark scheme showing where the marks go.

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