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1.1 Cell structure

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Question 23

A veterinary laboratory spreads one species of bacterium over a nutrient agar plate. Paper discs soaked in antibiotic R, antibiotic S and sterile water are placed on the agar. After incubation, which observation shows that the sterile water has not killed any bacteria?

[1]
A

Bacteria grow right up to the edge of the sterile-water disc, leaving no clear zone

B

The clear zone around disc R is a different size from the clear zone around disc S

C

A small clear zone forms around the sterile-water disc, smaller than those around R and S

D

Clear zones form around both disc R and disc S, showing that both antibiotics work

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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