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1.1 Cell structure

1.1 Cell structure

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Question 47

A biologist measures the concentration of yeast cells in a liquid culture using a specialized counting chamber.

Here is the method used:

  1. Dilute 2.0 cm32.0\text{ cm}^32.0 cm3 of the culture to a total volume of 10 cm310\text{ cm}^310 cm3 with distilled water.
  2. Place a drop of this diluted culture on the counting slide.
  3. Place a coverslip over the slide to set a liquid depth of 0.1 mm0.1\text{ mm}0.1 mm.
  4. Count the number of yeast cells within a 0.2 mm×0.2 mm0.2\text{ mm} \times 0.2\text{ mm}0.2 mm×0.2 mm square grid.

The biologist counted 181818 yeast cells in the 0.2 mm×0.2 mm0.2\text{ mm} \times 0.2\text{ mm}0.2 mm×0.2 mm grid area.

Calculate the number of yeast cells in 1.0 mm31.0\text{ mm}^31.0 mm3 of the undiluted yeast culture.

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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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