Mrs. Keadle JH Science
Name__________________________________ period _____
date assigned_____________ date due ______________ date returned _____________
The Cell Cycle Guided Reading
1. List three things that multi-celled organisms need cell division for.
a. _____________________________________________________________________
b. _____________________________________________________________________
c. _____________________________________________________________________
2. Why do single-celled organisms need to go through cell division? ______________________
___________________________________________________________________________
____________________________________________________________________________
3. What is the cell cycle? _________________________________________________________
____________________________________________________________________________
4. True or False:
__________ All cells go through the cell cycle in the same amount of time.
__________ Some cells in the human body do not undergo mitosis and cannot repair
themselves.
5. Cells that undergo mitosis spend _________________ of their time in interphase.
6. During interphase, the most important thing that takes place is________________________
___________________________________________________________________________
7. Why is it important for a cell to copy its genetic material before dividing? _______________
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
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The Cell Cycle Guided Reading
Mrs. Keadle JH Science
The Stages of Interphase
Complete the chart detailing the stages of interphase. Color and label each portion of the chart
and diagram the color given.
Color
Phase
description
none
Gap 0
G0 8.
blue
Gap 1
G1 9.
red
Synthesis
S
green
Gap 2
G2 11.
purple
Mitosis
M
10.
12.
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The Cell Cycle Guided Reading
Mrs. Keadle JH Science
Mitosis
Complete the diagram by cutting out the pictures and descriptions on the last page and gluing them in the correct order to show the
phases of mitosis.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
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The Cell Cycle Guided Reading
Mrs. Keadle JH Science
After mitosis is complete, there is one step left before the two cells can completely separate
from each other. This process in which the cytoplasm divides is called cytokinesis.
Under each picture, describe what is happening.
25.
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26.
_______________________________________
_______________________________________
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27. What are two important things should you remember about mitosis?
a. ________________________________________________________________________
________________________________________________________________________
b. ________________________________________________________________________
________________________________________________________________________
28. What can happen if a mistake occurs during mitosis? _______________________________
__________________________________________________________________________
__________________________________________________________________________
__________________________________________________________________________
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The Cell Cycle Guided Reading
Mrs. Keadle JH Science
29 During mitosis, DNA is copied and passed on to new cells. In which part of the cell is this hereditary
material located?
A cell membrane
B cytoplasm
C nucleus
D cell wall
30 During which phase of mitosis do the two separate nuclei appear?
A telophase
B anaphase
C early prophase
D late prophase
31 Based on the process shown in the diagram above, which of the following is a valid conclusion?
A First the cells divide, then mitosis occurs, and then the chromosomes are copied.
B First mitosis occurs, then the cells divide, and then mitosis occurs again.
C First the chromosomes are copied, then endocytosis occurs, and then the cells divide.
D First the chromosomes are copied, then mitosis occurs, and then the cells divide.
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The Cell Cycle Guided Reading
Mrs. Keadle JH Science
32 If you damage your skin, what process do
your cells use to make repairs (scabs and
new skin)?
33 What would happen to an organism if it’s
cells could no longer undergo mitosis?
A nothing
A spontaneous generation
B it would grow larger
B mitosis
C it would stop growing and die
C meiosis
D it would shrink
D the cell theory
34 Beginning with interphase, what are the phases of mitosis in order?
A telophase, anaphase, metaphase, prophase
B anaphase, metaphase, prophase, telophase
C prophase, anaphase, metaphase, telophase
D prophase, metaphase, anaphase, telophase
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The Cell Cycle Guided Reading
Mrs. Keadle JH Science
35 In which phase of the cell cycle do cells
spend 95% of their time?
A metaphase
36 After mitosis is complete, how are the
two cells alike?
A they both have double the
chromosomes
B anaphase
C interphase
B they are identical copies of each
other
D prophase
C the new cell has half the DNA
D one cell is newer than the other
37 Your body has a layer of skin that protects it from the environment. This layer of skin is made up of
many individual skin cells. Explain where all the cells came from and how two individual cells share
the same traits.
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The Cell Cycle Guided Reading
Mrs. Keadle JH Science
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The Cell Cycle Guided Reading
Mrs. Keadle JH Science
Cut these cards apart and place in the correct order on page 3 of this assignment. Make sure you glue them in the correct order.
telophase
prophase
metaphase
anaphase
each centromere divides and
the spindle fibers shorten.
Each pair of chromatids
seperates, and chromatids
begin to move to opposite
ends of the cell. The seprated
chromatids are now called
chromosomes.
spindle fibers start to
disappear, the chromosomes
start to uncoil, and a new
nucleus forms.
the pairs of chromatids are
fully visible when viewed
under a microscope. The
nucleolus and nuclear
membrane disappear. Two
small structures called
centrioles move to opposite
ends of the cell. Between the
centrioles, threadlike spindle
fibers begin to stretch across
the cell.
pairs of chromatids line up
across the center of the cell.
The centromere of each pair
usually becomes attached to
two spindle fibers – one from
each side of the cell.
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The Cell Cycle Guided Reading