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Step two: Think about your answer before looking at the possible choices.

  Answer the question in your head, pretending it’s an essay or short-answer question. The important ideas here are that surface area is determined by the square of the radius, and volume by the cube. Surface areas, volumes, and surface area–to-volume ratios for the two cells will thus be different.

  [Cell A] is a roughly [spherical] animal cell with a [radius of 10 microns]. [Cell B] is also roughly [spherical] and has a [radius of 20 microns]. Which of the following statements about these two cells is [false]?

  1. Cell A has a smaller volume than cell B.
  2. Cell B has a larger surface area than cell A.
  3. Cell A has a larger surface area–to-volume ratio than does cell B.
  4. Cell B has a larger surface area–to-volume ratio than does cell A.

 


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