3. At which stage does the number of chromosomes duplicate? 
 
  a. G1 stage                      c. S stage 
  b. G2 stage                      d. Mitotic stage 

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4. Most of your body cells (somatic) are not dividing. In which stage are these cells located? 

   a. G1 stage                      c. S stage 
   b. G2 stage                      d. Mitotic stage 
 
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The longest stage in the cell cycle is interphase. It includes G1, S and G2. Many cells, once they are formed will spend their entire lives in this stage. Study behavioral objective 8. 

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