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1.1 Cell structure

1.1 Cell structure

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Question 55
F

A student investigated three antiseptics, A, B and C. She placed a paper disc soaked in each antiseptic onto a lawn of bacteria. She also placed a fourth paper disc, soaked in sterile water, onto the same plate.

a.

Explain why the disc soaked in sterile water was used.

[2]
b.

There was no clear zone around the disc soaked in sterile water. Explain what this result shows.

[1]
c.

The same species of bacterium was used across the whole plate. Explain why this is important.

[2]
d.

Suggest one way the student could make her comparison of the three antiseptics more reliable.

[1]
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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