112
UNIT ONE
23
Describe the events of mitosis in sequence. (p. 101)
3.5 Control of Cell Division
24
List F
ve factors that control when and if a cell divides.
(p. 103)
25
Explain why it is important for the cell cycle to be highly
regulated. (p. 104)
26
Discuss the consequences of too little cell division and
too much cell division. (p. 104)
27
Distinguish between the ways that mutations in oncogenes
and tumor suppressor genes cause cancer. (p. 104)
3.6 Stem and Progenitor Cells
28
DeF
ne
dif
erentiation
. (p. 105)
29
A stem cell ______________. (p. 105)
a. self-renews
b. dies after F
fty divisions
c. is di±
erentiated
d. gives rise only to fully di±
erentiated daughter cells
e. forms from a progenitor cell
30
Which of the following is true? (p. 105)
a. Progenitor cells are totiptent and stem cells are dif-
ferentiated.
b. Stem cells are totipotent and progenitor cells are dif-
ferentiated.
c. Di±
erentiated cells are pluripotent until they specialize.
d. Stem cells in the early embryo are totipotent and
progenitor cells are pluripotent.
e. Stem cells in the early embryo are pluripotent and
progenitor cells are totipotent.
31
Describe a general function of stem cells in the body.
(p. 106)
3.7 Cell Death
32
Explain how apoptosis (cell death) can be a normal part
of development. (p. 106)
33
Provide an example of apoptosis. (p. 106)
34
List the steps of apoptosis. (p. 106)
35
Distinguish between necrosis and apoptosis. (p. 106)
36
Describe the relationship between apoptosis and mitosis.
(p. 109)
14
Match the transport mechanisms on the left with their
descriptions on the right. (pp. 90–98)
(1) di±
usion
(2) facilitated
di±
usion
(3) F
ltration
(4) active transport
(5) endocytosis
(6) exocytosis
A. The cell membrane engulfs a
particle or substance, drawing it
into the cell in a vesicle
B. Movement down the concen-
tration gradient with a carrier
protein, without energy input
C. Movement down the concentra-
tion gradient without a carrier
protein or energy input
D. A particle or substance leaves a
cell in a vesicle that merges with
the cell membrane
E. Movement against the concentra-
tion gradient with energy input
². Hydrostatic pressure forces sub-
stances through membranes
15
DeF
ne
osmosis
.
(p. 93)
16
Distinguish between hypertonic, hypotonic, and isotonic
solutions. (p. 94)
17
Explain how phagocytosis di±
ers from receptor-mediated
endocytosis. (p. 97)
18
Explain how transcytosis combines endocytosis and
exocytosis. (p. 98)
3.4 The Cell Cycle
19
The period of the cell cycle when DNA replicates
is____________. (p. 100)
a. G
1
phase
b. G
2
phase
c. S phase
d. prophase
e. telophase
20
Explain why interphase is not a period of rest for a cell.
(p. 100)
21
Explain how meiosis di±
ers from mitosis. (p. 100)
22
____________________occur simultaneously. (p. 101)
a. G
1
phase and G
2
phase
b. Interphase and mitosis
c. Cytokinesis and telophase
d. Prophase and metaphase
e. Meiosis and mitotic metaphase
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