AQA Biology A-Level - Cell Cycle and Mitosis QP
Q1.
(a) Describe binary fission in bacteria.
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
(3)
The cell growth rate of the bacterium Bacillus subtilis is proportional to its mass
immediately after binary fission.
The graph below shows this relationship.
Page 1 of 22
,AQA Biology A-Level - Cell Cycle and Mitosis QP
(b) The mass of the bacterial cells was measured in femtograms (fg).
1 fg (femtogram) = 1 × 10-15 g
Place a tick (✓) in the box next to the number that is equal to 680 fg
0.000 000 000 006 8 g
6.8 × 10-13 g
6.8 × 10-15 g
6.8 × 10-17 g
(1)
A scientist determined the growth rate of a B. subtilis cell by measuring its mass
for 5 minutes.
In those 5 minutes, the cell’s mass increased by 90 fg
(c) Use this information and the graph above to determine the mass of this cell
immediately after binary fission.
Show your working.
Answer _______________ fg
(2)
Page 2 of 22
, AQA Biology A-Level - Cell Cycle and Mitosis QP
(d) Suggest and explain how two environmental variables could be changed
to increase the growth rate of these cells.
Suggestion 1 _______________________________________________
___________________________________________________________
___________________________________________________________
Explanation _________________________________________________
___________________________________________________________
___________________________________________________________
Suggestion 2 _______________________________________________
___________________________________________________________
___________________________________________________________
Explanation _________________________________________________
___________________________________________________________
___________________________________________________________
(4)
(Total 10 marks)
Q2.
This question is about mitosis in cells.
The image below shows the arrangement of the genetic material in a cell during
prophase.
Page 3 of 22
Q1.
(a) Describe binary fission in bacteria.
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
(3)
The cell growth rate of the bacterium Bacillus subtilis is proportional to its mass
immediately after binary fission.
The graph below shows this relationship.
Page 1 of 22
,AQA Biology A-Level - Cell Cycle and Mitosis QP
(b) The mass of the bacterial cells was measured in femtograms (fg).
1 fg (femtogram) = 1 × 10-15 g
Place a tick (✓) in the box next to the number that is equal to 680 fg
0.000 000 000 006 8 g
6.8 × 10-13 g
6.8 × 10-15 g
6.8 × 10-17 g
(1)
A scientist determined the growth rate of a B. subtilis cell by measuring its mass
for 5 minutes.
In those 5 minutes, the cell’s mass increased by 90 fg
(c) Use this information and the graph above to determine the mass of this cell
immediately after binary fission.
Show your working.
Answer _______________ fg
(2)
Page 2 of 22
, AQA Biology A-Level - Cell Cycle and Mitosis QP
(d) Suggest and explain how two environmental variables could be changed
to increase the growth rate of these cells.
Suggestion 1 _______________________________________________
___________________________________________________________
___________________________________________________________
Explanation _________________________________________________
___________________________________________________________
___________________________________________________________
Suggestion 2 _______________________________________________
___________________________________________________________
___________________________________________________________
Explanation _________________________________________________
___________________________________________________________
___________________________________________________________
(4)
(Total 10 marks)
Q2.
This question is about mitosis in cells.
The image below shows the arrangement of the genetic material in a cell during
prophase.
Page 3 of 22
