Figure 6 shows photographs of some animal cells at different stages during the cell cycle - AQA - GCSE Biology - Question 9 - 2018 - Paper 1
Question 9
Figure 6 shows photographs of some animal cells at different stages during the cell cycle.
**Figure 6**
A
B
C
Which photograph in Figure 6 shows a cell that is ... show full transcript
Worked Solution & Example Answer:Figure 6 shows photographs of some animal cells at different stages during the cell cycle - AQA - GCSE Biology - Question 9 - 2018 - Paper 1
Step 1
Which photograph in Figure 6 shows a cell that is not going through mitosis?
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Answer
C
Step 2
Describe what is happening in photograph A.
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Answer
In photograph A, the cell is in the process of cytokinesis, where the cytoplasm and cell membrane are dividing. This stage involves the separation of the cell into two identical daughter cells.
Step 3
Which stage in Table 4 is the fastest in the cell cycle?
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Answer
Stage 4. Only one cell is seen in this stage, indicating a rapid progression through this part of the cycle.
Step 4
Calculate the length of time Stage 2 lasts in a typical cell.
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Answer
To calculate the time spent in Stage 2, we first find the proportion of cells in Stage 2 relative to the total.
Using the formula: ext{Time in Stage 2} = rac{ ext{Number of cells in Stage 2}}{ ext{Total number of cells}} imes ext{Total cycle time}
Substituting the values from Table 4: ext{Time in Stage 2} = rac{4}{36} imes 16 imes 60 ext{ minutes} = 110 ext{ minutes}
Step 5
What type of cell division causes the change in number of E. coli cells at P?
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Answer
The type of cell division is binary fission.
Step 6
Suggest why the number of cells levels out at Q.
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Answer
The number of cells levels out at Q due to a shortage of nutrients or oxygen, which limits the growth and division of the cells. This growth plateau indicates that the death rate equals the rate of cell division.
