One type of eukaryotic cell (line 1) spends 24 minutes in S phase and another type of cell (line 2) spends 48 minutes in S phase. Which of the following statements is the best explanation for the difference in time spent in S phase by cell lines 1 and 2? 
Amount of DNA per nucleus over the cell division cycle.
A) Line 2 contains more DNA than line 1.
B) Lines 1 and 2 contain the same amount of DNA.
C) Line 1 cells reproduce by binary fission and line 2 cells reproduce by mitosis and cytokinesis.
D) Line 2 has plant cells and line 1 has animal cells.
Correct Answer:
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