Question

The size of most of the cells is best expressed in

• A. Angstrom ($\dot{A}$)
• B. Millimeters (mm)
• C. Nanometers (nm)
• D. Micrometers ($\mu$m)

Answer 1

Answer: (D)

• Cells are broadly defined as microscopic structures.
• As a result, measuring them can be very difficult. The units used to describe objects on a microscopic length scale are most commonly the micrometer, i.e. one-millionth of 1 meter.
  
• Apart from that, a millimeter is too large a unit to express correctly the size of a cell, while angstrom and nanometers are very small units.
  

So the correct answer is option D.