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Sagot :
To solve this problem, we need to determine the time each phase of the cell cycle ends and calculate the percentage of time the cell spends in each phase.
### Hours spent in each phase:
- [tex]\( G_1 \)[/tex]: 11 hours
- [tex]\( S \)[/tex]: 8 hours
- [tex]\( G_2 \)[/tex]: 4 hours
- [tex]\( M \)[/tex]: 1 hour
### Total hours in a day:
- 24 hours
### Step-by-Step Solution
1. Calculate the ending time for each phase:
- End of [tex]\( G_1 \)[/tex] phase:
Since the [tex]\( G_1 \)[/tex] phase starts at midnight (00:00) and lasts for 11 hours, it will end at:
[tex]\[ \text{End of } G_1 = 00:00 + 11 \text{ hours} = 11:00 \][/tex]
- End of [tex]\( S \)[/tex] phase:
The [tex]\( S \)[/tex] phase starts right after [tex]\( G_1 \)[/tex] ends. It begins at 11:00 and lasts for 8 hours:
[tex]\[ \text{End of S} = 11:00 + 8 \text{ hours} = 19:00 \][/tex]
- End of [tex]\( G_2 \)[/tex] phase:
The [tex]\( G_2 \)[/tex] phase starts right after [tex]\( S \)[/tex] ends. It begins at 19:00 and lasts for 4 hours:
[tex]\[ \text{End of } G_2 = 19:00 + 4 \text{ hours} = 23:00 \][/tex]
- End of [tex]\( M \)[/tex] phase:
The [tex]\( M \)[/tex] phase starts right after [tex]\( G_2 \)[/tex] ends. It begins at 23:00 and lasts for 1 hour:
[tex]\[ \text{End of M} = 23:00 + 1 \text{ hour} = 24:00 \text{ (or midnight)} \][/tex]
2. Calculate the percentage of time spent in each phase:
- Percentage of time in [tex]\( G_1 \)[/tex]:
[tex]\[ \text{Percentage of } G_1 = \left( \frac{11 \text{ hours}}{24 \text{ hours}} \right) \times 100 = 45.83\% \][/tex]
- Percentage of time in [tex]\( S \)[/tex]:
[tex]\[ \text{Percentage of } S = \left( \frac{8 \text{ hours}}{24 \text{ hours}} \right) \times 100 = 33.33\% \][/tex]
- Percentage of time in [tex]\( G_2 \)[/tex]:
[tex]\[ \text{Percentage of } G_2 = \left( \frac{4 \text{ hours}}{24 \text{ hours}} \right) \times 100 = 16.67\% \][/tex]
- Percentage of time in [tex]\( M \)[/tex]:
[tex]\[ \text{Percentage of } M = \left( \frac{1 \text{ hour}}{24 \text{ hours}} \right) \times 100 = 4.17\% \][/tex]
### Completed Table 1:
[tex]\[ \begin{array}{|c|c|c|c|c|} \hline \text{Phase of cell cycle} & G_1 & S & G_2 & M \\ \hline \text{Hours spent in phase} & 11 & 8 & 4 & 1 \\ \hline \text{Time when phase ends} & 11:00 & 19:00 & 23:00 & 24:00 \\ \hline \text{Percentage of total time in phase} & 45.83\% & 33.33\% & 16.67\% & 4.17\% \\ \hline \end{array} \][/tex]
### Clock Labeling:
You can now use the time intervals and percentages to label the clock as follows:
- [tex]\( G_1 \)[/tex] phase from midnight (00:00) to 11:00 (45.83% of the cycle)
- [tex]\( S \)[/tex] phase from 11:00 to 19:00 (33.33% of the cycle)
- [tex]\( G_2 \)[/tex] phase from 19:00 to 23:00 (16.67% of the cycle)
- [tex]\( M \)[/tex] phase from 23:00 to midnight (24:00) (4.17% of the cycle)
This completes the step-by-step solution for both determining the end times and calculating the percentages for each phase in the cell cycle.
### Hours spent in each phase:
- [tex]\( G_1 \)[/tex]: 11 hours
- [tex]\( S \)[/tex]: 8 hours
- [tex]\( G_2 \)[/tex]: 4 hours
- [tex]\( M \)[/tex]: 1 hour
### Total hours in a day:
- 24 hours
### Step-by-Step Solution
1. Calculate the ending time for each phase:
- End of [tex]\( G_1 \)[/tex] phase:
Since the [tex]\( G_1 \)[/tex] phase starts at midnight (00:00) and lasts for 11 hours, it will end at:
[tex]\[ \text{End of } G_1 = 00:00 + 11 \text{ hours} = 11:00 \][/tex]
- End of [tex]\( S \)[/tex] phase:
The [tex]\( S \)[/tex] phase starts right after [tex]\( G_1 \)[/tex] ends. It begins at 11:00 and lasts for 8 hours:
[tex]\[ \text{End of S} = 11:00 + 8 \text{ hours} = 19:00 \][/tex]
- End of [tex]\( G_2 \)[/tex] phase:
The [tex]\( G_2 \)[/tex] phase starts right after [tex]\( S \)[/tex] ends. It begins at 19:00 and lasts for 4 hours:
[tex]\[ \text{End of } G_2 = 19:00 + 4 \text{ hours} = 23:00 \][/tex]
- End of [tex]\( M \)[/tex] phase:
The [tex]\( M \)[/tex] phase starts right after [tex]\( G_2 \)[/tex] ends. It begins at 23:00 and lasts for 1 hour:
[tex]\[ \text{End of M} = 23:00 + 1 \text{ hour} = 24:00 \text{ (or midnight)} \][/tex]
2. Calculate the percentage of time spent in each phase:
- Percentage of time in [tex]\( G_1 \)[/tex]:
[tex]\[ \text{Percentage of } G_1 = \left( \frac{11 \text{ hours}}{24 \text{ hours}} \right) \times 100 = 45.83\% \][/tex]
- Percentage of time in [tex]\( S \)[/tex]:
[tex]\[ \text{Percentage of } S = \left( \frac{8 \text{ hours}}{24 \text{ hours}} \right) \times 100 = 33.33\% \][/tex]
- Percentage of time in [tex]\( G_2 \)[/tex]:
[tex]\[ \text{Percentage of } G_2 = \left( \frac{4 \text{ hours}}{24 \text{ hours}} \right) \times 100 = 16.67\% \][/tex]
- Percentage of time in [tex]\( M \)[/tex]:
[tex]\[ \text{Percentage of } M = \left( \frac{1 \text{ hour}}{24 \text{ hours}} \right) \times 100 = 4.17\% \][/tex]
### Completed Table 1:
[tex]\[ \begin{array}{|c|c|c|c|c|} \hline \text{Phase of cell cycle} & G_1 & S & G_2 & M \\ \hline \text{Hours spent in phase} & 11 & 8 & 4 & 1 \\ \hline \text{Time when phase ends} & 11:00 & 19:00 & 23:00 & 24:00 \\ \hline \text{Percentage of total time in phase} & 45.83\% & 33.33\% & 16.67\% & 4.17\% \\ \hline \end{array} \][/tex]
### Clock Labeling:
You can now use the time intervals and percentages to label the clock as follows:
- [tex]\( G_1 \)[/tex] phase from midnight (00:00) to 11:00 (45.83% of the cycle)
- [tex]\( S \)[/tex] phase from 11:00 to 19:00 (33.33% of the cycle)
- [tex]\( G_2 \)[/tex] phase from 19:00 to 23:00 (16.67% of the cycle)
- [tex]\( M \)[/tex] phase from 23:00 to midnight (24:00) (4.17% of the cycle)
This completes the step-by-step solution for both determining the end times and calculating the percentages for each phase in the cell cycle.
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