A group of cells is assayed for DNA content immediately following mitosis and is fond to have an average of 8 picograms of DNA per nucleus. Those cells would have how many picograms at the end of the S phase and at the end of G2.
Correct answer: C. 16; 16
- A. 8; 16
- B. 16; 8
- C. 16; 16
- D. 12; 16
Explanation
If a group of cells is assayed for DNA content immediately following mitosis and is found to have an average of 8 picograms of DNA per nucleus, then at the end of the S phase, each nucleus would have 16 picograms of DNA. This is because during the S phase, DNA replication occurs, doubling the amount of DNA in each nucleus.At the end of the G2 phase, just before mitosis begins, the DNA content remains the same as at the end of the S phase. Therefore, each nucleus would still have 16 picograms of DNA. During the G2 phase, there is no additional DNA replication; instead, the cell prepares for mitosis.
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