Chapter 12: The Cell Cycle A group of cells is assayed for DNA content and is fo
ID: 266707 • Letter: C
Question
Chapter 12: The Cell Cycle A group of cells is assayed for DNA content and is found to have an average of 8 picograms of DNA per nucleus. Picograms are a relatively small unit of weight: You stimulate your cells to enter mitosis, and keep checking for DNA content. 1 point each 24. How many picograms per nucleus would be found at the end of G1? 25. How many picograms per nucleus would be found at the end of S? 26. How many picograms per nucleus would be found at the end of G2? 27. How many picograms per nucleus would be found at the end of mitosis?Explanation / Answer
24) How many picograms per nucleus would found at the end of G1? 8 picograms
At G1 phase cells get ready for replication of DNA in S-phase, the cell volume increases in G1 phase but not DNA content. So at the end of G1 phase cell would have same DNA content.
25) How many picograms per nucleus would be found at the end of S? 16 picograms
In S phase cells have replicated their DNA, so the DNA content would be doubled at the end of S phase
26) How many picograms per nucleus would be found at the end of G2? 16 picograms
In G2 phase cells get prepared for mitosis, so the DNA content would remain the same as that of in S phase
27) How many picograms per nucleus would be found at the end of mitosis? 8 picograms
In mitosis, each cell gets divided in to two cells. Each cell gets half the DNA content form parent cell. As mentioned above, each cell has 16 picograms of DNA. When this cell gets divided, each new cell gets 8 picograms of DNA.
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