Biology 9700 · AS & A Level · The microscope in cell studies

The microscope in cell studies — practice question

Cell diameters can differ greatly. Representative diameters are: - a eukaryote, such as a white blood cell: $1.5 \times 10^{1}\,\mu\text{m}$ - a prokaryote, such as Streptococcus: $7.5 \times 10^{2}\,\text{nm}$ From these measurements, determine the greatest number of each cell type that could be placed in a straight line of length $1\text{ cm}$.

  • Anumber of white blood cells $6.7 \times 10^{3}$; number of Streptococcus cells $1.3 \times 10^{5}$
  • Bnumber of white blood cells $6.7 \times 10^{2}$; number of Streptococcus cells $1.3 \times 10^{4}$
  • Cnumber of white blood cells $6.7 \times 10^{1}$; number of Streptococcus cells $1.3 \times 10^{3}$
  • Dnumber of white blood cells $6.7 \times 10^{0}$; number of Streptococcus cells $1.3 \times 10^{2}$

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