1.2 Cell division

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Question 5
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An electron microscope image is used to compare the dimensions of two different microscopic structures:

  • Bacterium (Escherichia coli) length: 1.6 μm1.6\text{ }\mu\text{m}1.6 μm
  • Human epithelial cell diameter: 0.08 mm
a.

Calculate the ratio of the length of the bacterium to the diameter of the epithelial cell. Give your answer in the form 1:n1 : n1:n.

[2]
b.

The cell cycle of an actively dividing epithelial cell is represented by a circular diagram divided into 40 equal sectors.

  • Stage 1 (Interphase) occupies 31 sectors.
  • Stage 2 (Mitosis) occupies 6 sectors.
  • Stage 3 (Cytokinesis) occupies 3 sectors.

Calculate the percentage of the total cell cycle duration represented by Stage 2 and Stage 3 combined.

[2]

1.2 Cell division Questions

  1. GCSE
  2. /Biology
  3. /1.2 Cell division