The diameter of living cells varies considerably.
Typical diameters are:
a prokaryote, such as Streptococcus - 750nm
a eukaryotic cell, such as a white blood cell - $15\mu m$
Given these measurements, the diameter of the white blood cell is how many times greater than the prokaryote?
1 )
x 2
x 20
3 )
x 50
4 )
x 200
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