Download HW 5 Producing New Cells

Cell Biology Homework – Key Area: Producing new cells
Homework Exercise 5
1. The diagram below shows the different stages of cell division in a
plant root tip.
B
z
C
A
D
F
E
(a) Place the stages labelled A- F in the correct order
B
(1)
(b)(i) Identify structure Z
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(ii) Describe the role of structure Z in cell division
(1)
(c) During cell division the chromosomes line up along the middle of the
cell. State the term biologists use to describe that region of the
cell.
(1)
(d ) What is the function of mitosis
(1)
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Cell Biology Homework – Key Area: Producing new cells
(e) Name the part of the chromosome labelled A on the diagram below.
A
(1)
3. Copy and complete the following sentences by selecting the correct option
in each choice bracket.
Cells produced by mitosis have
and are described as being
one matching set
two matching sets
haploid
diploid
13
.
of chromosomes,
(1)
Cell Biology Homework – Key Area: Producing new cells
3. Typical timings of the stages of mitosis are shown in the table below.
Stage
Time
(minutes)
A
B
C
D
E
12
2
6
3
7
(a) Draw a bar graph of the results
Time
(minutes
)
(2)
(b) What percentage of the total time for mitosis is taken
by stage C?
(1)
(c) What is the ratio of the time spent in stage D compared to stage A?
Ratio
Stage D : Stage A
______ : ______
(1)
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Cell Biology Homework – Key Area: Producing new cells
4* The following diagram shows a cell undergoing cell division.
(a) What term is used to describe the two cells produced at the end of
the process?
(1)
(b) State how many chromosomes would be in each of the cells produced
(1)
(c) Name the disease that causes cells to continually divide.
(1)
(d) Why is it important daughter cells produced by this type of division
contain the same number of chromosomes as the parent cell?
(1)
5* If a cell divides every 30 minutes, calculate how many cells there would
be after three hours. Copy and complete the table below.
Time (minutes)
Start
0
30
60
minutes minutes
minutes
Number of cells
1
2
4
15
(1)