For a diploid mouse cell (40 chromosomes), state how many copiesof each are present at the following cell cycle stages:
| Number of chromosomes per cell | Number of sister chromatids per cell  | Number of centromeres per cell | Number of chromosome copies attached to each centromere |
| | | | |
| G2 phase | | | | |
| Prophase | | | | |
| Anaphase | | | | |
A researcher has synchronized two different E. colicultures so that all of the cells enter cell divisionsimultaneously. One culture is wild-type E. coli cells,and the other culture is a mutant E. coli that does nothave the gene for Dam methylase. He isolates the DNA from bothwild-type and mutant E. coli 20 minutes after replicationis complete. What is the methylation state for each strain ofE. coli? What would be the methylation state for eachbacterial strain if you isolated the DNA immediately afterreplication termination?
