Paper 1 H - SAMPLE SET 1 Q9 Answers
9) Figure 6 shows photographs of some animal cells at different stages during the cell cycle.
9.1) Which photograph in Figure 6 shows a cell that is not going through mitosis? [1 mark]
Tick one box.
Tick one box.
9.2) Describe what is happening in photograph A. [2 marks]
A student wanted to find out more about the cell cycle.
The student made a slide of an onion root tip.
She counted the number of cells in each stage of the cell cycle in one field of view.
Table 4 shows the results.
A student wanted to find out more about the cell cycle.
The student made a slide of an onion root tip.
She counted the number of cells in each stage of the cell cycle in one field of view.
Table 4 shows the results.
9.3) Each stage of the cell cycle takes a different amount of time.
Which stage in Table 4 is the fastest in the cell cycle?
Give a reason for your answer. [2 marks]
Stage _______________________________________
Reason ______________________________________
9.4) The cell cycle in an onion root tip cell takes 16 hours.
Calculate the length of time Stage 2 lasts in a typical cell.
Give your answer to 2 significant figures. [3 marks]
Which stage in Table 4 is the fastest in the cell cycle?
Give a reason for your answer. [2 marks]
Stage _______________________________________
Reason ______________________________________
9.4) The cell cycle in an onion root tip cell takes 16 hours.
Calculate the length of time Stage 2 lasts in a typical cell.
Give your answer to 2 significant figures. [3 marks]
Time in Stage 2 = _____________ minutes
Bacteria such as Escherichia coli undergo cell division similar to mitosis.
Figure 7 shows a growth curve for E. coli grown in a nutrient broth.
Figure 7 shows a growth curve for E. coli grown in a nutrient broth.
9.5) What type of cell division causes the change in number of E. coli cells at P? [1 mark]
9.6) Suggest why the number of cells levels out at Q. [2 marks]
(Total for Question 9 = 11 marks)
9.6) Suggest why the number of cells levels out at Q. [2 marks]
(Total for Question 9 = 11 marks)