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

The microscope in cell studies — practice question

Cell diameters can differ widely. A typical eukaryotic cell has a diameter of $1.5 \times 10^{1}\ \mu\text{m}$. A typical prokaryotic cell has a diameter of $7.5 \times 10^{2}\ \text{nm}$. From these values, determine the greatest number of cells of each type that could be arranged along a straight line measuring $1\ \text{cm}$ in length.

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

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