Pearson Edexcel GCE
In AS Biology (8BI0_01)
Paper 1: Core Cellular Biology and
Microbiology
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2022 xcel B
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• diameter measured and mean value calculated (1) 44 (mm) / 4.4 (cm) and 0.019 (mm)
• 2 316 (1) ecf if either 44 (mm) or 0.019 used and answer
rounded up to whole number correctly
e.g. (45 and 0.019 =) 2 368 (2)
Correct answer with no working gets 2 marks
Question Answer Additional Guidance Mark
Number
1(b) A description that makes reference to three of the following:
• use an (eye piece) graticule to measure the diameter (1) ACCEPT length / size
• take several measurements and calculate the mean (for each cell) (1)
• calibrate the (eye piece) graticule (1) ACCEPT a description of how this is done
• using a stage micrometer (1) (3)
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