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Item EB056001: When a mouse grows, its increased mass comes from atoms of molecules from its food that were incorporated into its body structures.

Over the course of 7 weeks, a baby mouse with a mass of 0.5 grams grows into an adult mouse with a mass of 19 grams. Where does the additional 18.5 grams of mass in the animal’s body come from?

  1. The mouse gains mass from atoms it creates. As it grows, its body uses energy from the molecules that make up its food to create these atoms.
  2. The mouse gains mass from the atoms of newly created cells. As it grows, its cells divide, increasing the total number of atoms.
  3. The mouse gains mass from the atoms that make up the molecules in its food. As it grows, these atoms become part of body structures.
  4. The mouse gains mass from the atoms that make up the molecules in its food. As it grows, these molecules are kept inside the mouse’s body but do not become a part of it.
Distribution of Responses
Chart showing distrubtion of responses for Item 056001
Points Earned
Group Correct Total Percent
Overall 95 259 37%
Grades
  6–8 N/A N/A N/A
  9–12 88 226 39%
Gender
  Male5313440%
  Female339136%
Primary Language
  English8121338%
  Other51145%

View data table

Distribution of Responses
Chart showing distrubtion of responses for Item 056001
Points Earned
Group Correct Total Percent
Overall 146 298 49%
Grades
  6–8 N/A N/A N/A
  9–12 135 270 50%
Gender
  Male6815145%
  Female6311555%
Primary Language
  English12325149%
  Other101567%

View data table