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1.1 Cell structure

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Question 9
79%

A scientist tests four antiseptics on a lawn of one species of bacterium isolated from a stream. Equal-sized paper discs containing antiseptics P, Q, R and S are placed on the lawn with the same volume of each antiseptic. After incubation, the clear zones have diameters of 18 mm around P, 9 mm around Q, 26 mm around R and 4 mm around S.

What do these measurements show about the antiseptics?

[1]
A

The antiseptic in disc Q was least effective at killing bacteria

B

The antiseptic in disc S was least effective at killing bacteria

C

The antiseptic in disc R was least effective at killing bacteria

D

The antiseptic in disc P was least effective at killing bacteria

Markscheme

1.1 Cell structure Questions

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

282 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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