A-LevelBiologyCell structure9700/12 · Feb/Mar 2018 · Q21 Mark
A student was asked to use the scale bar shown to calculate the magnification of a cell on a photomicrograph. [Figure showing a scale bar: 2 μm] Which method could the student use to calculate the magnification of the cell?
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Adivide the diameter of the cell by the length of the scale bar, both measured in the same units of length
Bmeasure the diameter of the cell in millimetres, multiply by 2000 and divide by the length of the scale bar measured in millimetres
Cmeasure the length of the scale bar in millimetres, convert to micrometres and divide by 2
Dmeasure the length of the scale bar in millimetres, convert to micrometres and multiply by 2
✓ Correct answer
C: measure the length of the scale bar in millimetres, convert to micrometres and divide by 2
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