Download Semester 1 Exam

Semester 1 Exam
Multiple Choice
Identify the choice that best completes the statement or answers the question.
1. Biology is the study of
people with symptoms of a disease and the
a. minerals.
number of people who had died from the
b. life.
disease
c. the weather.
c. analysis of data—comparison of the effects of
d. energy.
mixing monkey cells with virus-containing
blood in test tubes and the effects of mixing
2. All organisms possess DNA. DNA
liquid from these test tubes with fresh monkey
a. creates energy for cells.
cells
b. allows sensitivity to environmental stimuli.
d. inference making—identification of the Ebola
c. contains information for growth and
virus as the cause of a disease by taking
development.
electron micrographs of substances found in the
d. captures energy from the sun.
blood of persons affected with the disease
3. Instructions for traits that are passed from parents
9. A hypothesis is
to offspring are known as
a. a definite answer to a given problem.
a. a species plan.
b. a testable possible explanation of an
b. organ codes.
observation.
c. genes.
c.
a proven statement.
d. natural selections.
d. a concluding statement.
4. Homeostasis means
10.
A unifying explanation for a broad range of
a. a change over long periods of time.
observations is a
b. keeping things the same.
a. hypothesis.
c. rapid change.
b. theory.
d. the same thing as evolution.
c. prediction.
5. Ecology
d. controlled experiment.
a. refers to change in species over time.
11. Scientists usually design experiments
b. refers to a delicate internal balance within
a. with a good idea of the expected experimental
organisms.
results.
c. is inconsistent with evolution.
b.
based on wild guesses.
d. is the study of communities or organisms in
c. in order to develop new laboratory tools.
relation to their environment.
d. All of the above
6. All organisms are composed of
12.
The word theory used in a scientific sense means
a. diatoms.
a. a highly tested, generally accepted principle.
b. cellulose.
b. a guess made with very little knowledge to
c. cells.
support it.
d. None of the above
c.
an absolute scientific certainty.
7. Which of the following is a characteristic of all
d.
None of the above
living things?
13. Which of the following components of a scientific
a. movement
investigation would benefit from communication
b. photosynthesis
between scientists?
c. development
a. observing
d. cellular organization
b. measuring
8. Which example of scientific methodology is
c. analyzing data
incorrect?
d. All of the above
a. observation—a number of people in a certain
14. Typically, the order in which the steps of the
place dying of a disease outbreak
scientific method are applied is
b. measurement—a record of the number of
15.
16.
17.
18.
19.
20.
21.
a. observations, predictions, hypothesis,
controlled testing, theory, verification.
b. predictions, observations, hypothesis, theory,
controlled testing, verification.
c. observations, hypothesis, predictions,
controlled testing, theory, verification.
d. observations, hypothesis, predictions,
controlled testing, verification, theory.
A light microscope that has an objective lens of 10
and an ocular lens of 20 has a magnification of
a. 30 .
b. 200 .
c. 300 .
d. 2000 .
Which of the following is not an example of good
laboratory practice?
a. working alone in the lab
b. asking permission before using equipment
c. working with a partner in the lab
d. wearing goggles in the lab
Scientists share their research results by
a. publishing in scientific journals.
b. presenting at scientific meetings.
c. avoiding conflicts of interest.
d. Both a and b
Atoms are composed of
a. protons with a positive charge.
b. neutrons with no charge.
c. electrons with a negative charge.
d. All of the above
The smallest particle of carbon that can retain the
chemical properties of carbon is
a. a carbon molecule.
b. a carbon macromolecule.
c. a carbon atom.
d. the nucleus of a carbon atom.
Which of the following states of matter contain(s)
particles that are tightly linked together in a definite
shape?
a. solid
b. liquid
c. gas
d. solid and liquid
The bond formed when two atoms share a pair of
electrons is called a
a. hydrogen bond.
b. nonpolar bond.
c. covalent bond.
d. water bond.
22. An atom that has gained or lost electrons is called
a(n)
a. molecule.
b. nucleon.
c. ion.
d. element.
23. Oxidation-reduction reactions are important in
organisms because they
a. allow the passage of energy from molecule to
molecule.
b. prevent nuclear reactions from occurring.
c. allow the creation and destruction of energy.
d. None of the above; oxidation-reduction
reactions do not occur in living organisms.
24. A neutral solution has an equal number of
a. hydrogen and hydronium ions.
b. hydroxide and hydronium ions.
c. hydrogen and hydroxide ions.
d. oxygen and hydrogen ions.
25. A solution with a pH of 11 is
a. acidic.
b. alkaline.
c. neutral.
d. a buffer.
26. Acidic solutions have a pH that is
a. less than 7.
b. between 0 and 14.
c. a negative number.
d. more than 7.
27. Atoms become more stable when they form
compounds because
a. they always lose electrons when they form
compounds.
b. their outer orbitals become filled when they
form compounds.
c. they always gain electrons when they form
compounds.
d. their nucleus loses extra protons when they
form compounds.
28. A water molecule is polar because its hydrogen and
oxygen atoms
a. both lose electrons.
b. become ions.
c. both gain electrons.
d. do not share the electrons equally.
29. Carbon is different from many other elements in
that
a. it has four electrons in its outermost energy
level.
b. it readily bonds with other carbon atoms.
c. it can form single, double, or triple bonds with
other atoms.
d. All of the above
30. Which of the following is a carbohydrate?
a. DNA
b. insulin
c. wax
d. sucrose
31. Animals store glucose in the form of
a. cellulose.
b. glycogen.
c. wax.
d. lipids.
32. All of the following are examples of carbohydrates
except
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36.
37.
38.
39.
a. sugar.
b. cellulose.
c. steroids.
d. glycogen.
33. Which organic molecule below is most closely
related to proteins?
a. amino acids
b. CH2 chains
c. nucleotides
d. sugars
34. Long chains of amino acids are found in
a. carbohydrates.
b. lipids.
c. proteins.
d. sugars.
Refer to the illustration above. Molecules like molecule 2 are found in
a. carbohydrates.
c. nucleic acids.
b. lipids.
d. proteins.
Lipids are
40. Energy is released when the bond between
a. polar molecules.
a. carbon atoms in ATP is broken.
b. similar to water molecules.
b. ribose and adenine in ATP is broken.
c. protein molecules.
c. phosphate groups in ATP is broken.
d. nonpolar molecules.
d. two ATP molecules is broken.
Lipids are not soluble in
41. Without enzymes, the chemical reactions in the
a. water.
body would
b. salt water.
a. happen too fast.
c. oil.
b. occur at much the same rate as they do with
d. both a and b
enzymes.
Which organic molecule below is most closely
c. require a different pH.
related to lipids?
d. occur too slowly to support life processes.
a. amino acids
42. Carbon atoms can bond together to form all of the
b. CH2 chains
following except
c. nucleotides
a. ring structures.
d. sugars
b. inorganic structures.
Which organic molecule below is most closely
c. straight chain structures.
related to nucleic acids?
d. branched structures.
a. amino acids
43. Hooke’s discovery of cells was made observing
b. CH2 chains
a. living algal cells.
c. nucleotides
b. living human blood cells.
d. sugars
44.
45.
46.
47.
48.
49.
c. dead plant cells.
d. dead protist cells.
The smallest units of life in all living things are
a. cells.
b. mitochondria.
c. cytoplasm.
d. Golgi apparatus.
Which of the following is characteristic of
prokaryotes?
a. They have a nucleus.
b. They existed on Earth before eukaryotes.
c. The organelles in their cytoplasm are
surrounded by membranes.
d. None of the above
Which of the following is an example of a
prokaryotic cell?
a. an amoeba
b. a virus
c. a bacterium
d. a liver cell
Only eukaryotic cells have
a. DNA.
b. membrane-bound organelles.
c. ribosomes.
d. cytoplasm.
Studying a picture of a cell taken with an electron
microscope, you find that the cell has no nucleus
and no mitochondria, but it does have a plasma
membrane and a cell wall. You conclude that the
cell is probably from a(n)
a. animal.
b. plant.
c. prokaryote.
d. extinct organism.
The structure that regulates what enters and leaves
the cell is called the
50.
51.
52.
53.
54.
a. nucleus.
b. cell wall.
c. nuclear membrane.
d. plasma membrane.
A particularly active cell might contain large
numbers of
a. chromosomes.
b. vacuoles.
c. mitochondria.
d. walls.
In which of the following organelles is a cell’s ATP
produced?
a. mitochondrion
b. endoplasmic reticulum
c. Golgi apparatus
d. lysosome
Numerous hairlike organelles that protrude from
the surface of a cell and are packed in tight rows are
called
a. flagella.
b. microtubules.
c. actin filaments.
d. cilia.
The packaging and distribution center of the cell is
the
a. nucleus.
b. Golgi apparatus.
c. central vacuole.
d. nuclear envelope.
The double membrane surrounding the nucleus is
called the
a. nucleolus.
b. nuclear wall.
c. nucleoplasm.
d. nuclear envelope.
55. Refer to the illustration above. Which structure
immediately identifies this cell as a eukaryote?
a. structure 1
b. structure 2
c. structure 3
d. structure 4
56. Refer to the illustration above. This cell’s
chromosomes are found in
a. structure 1.
b. structure 2.
c. structure 3.
d. structure 5.
57. Refer to the illustration above. The cell shown is
probably an animal cell because
a. it has mitochondria.
b. it does not have a cell wall.
c. it has a plasma membrane.
d. it does not have a nucleus.
58. All of the following are found in both plant and
animal cells, except
a. a cell wall.
b. a plasma membrane.
c. mitochondria.
d. the endoplasmic reticulum.
59. The organelles associated with photosynthesis are
the
a. mitochondria.
b. chloroplasts.
c. Golgi apparatus.
d. vacuoles.
60. The organelles in plant cells that contain a green
pigment are the
a. mitochondria.
61.
62.
63.
64.
b. bilayer lipids.
c. chloroplasts.
d. Golgi apparatus.
Plant cells have a large membrane-bound space in
which water, waste products, and nutrients are
stored. This place is known as a
a. mitochondrion.
b. chloroplast.
c. Golgi apparatus.
d. central vacuole.
Plant cells
a. do not contain mitochondria.
b. have a cell wall instead of a plasma membrane.
c. have a large central vacuole instead of a Golgi
apparatus.
d. have chloroplasts and a cell wall.
Which of the following is the correct order of
organization of structures in living things, from
simplest to most complex?
a. organ systems, organs, tissues, cells
b. tissues, cells, organs, organ systems
c. cells, tissues, organ systems, organs
d. cells, tissues, organs, organ systems
As a result of diffusion, the concentration of many
types of substances
a. always remains greater inside a membrane.
b. eventually becomes balanced on both sides of a
membrane.
c. always remains greater on the outside of a
membrane.
d. becomes imbalanced on both sides of a
membrane.
65. Refer to the illustration above. In which direction are water molecules in this system most likely to diffuse?
a. from 1 to 2
c. from 4 to 3
b. from 2 to 4
d. from 3 to 1
66.
Refer to the illustration above. The process shown is called
a. osmosis.
c. active transport.
b. facilitated diffusion.
d. diffusion.
67. Molecules that are too large to be moved across a
70. Heterotrophs are organisms that can
cell membrane can be removed from the cell by
a. produce food from inorganic molecules and
a. diffusion.
sunlight.
b. exocytosis.
b. survive without energy.
c. lipid carriers.
c. consume other organisms for energy.
d. osmosis.
d. carry out either photosynthesis or
chemosynthesis.
68. Molecules that are too large to be moved through
the membrane can be transported into the cell by
71. Based on the cycle of photosynthesis and cellular
a. osmosis.
respiration, one can say that the ultimate original
b. endocytosis.
source of energy for all living things on Earth is
c. lipid carriers.
a. glucose.
d. diffusion.
b. water.
c. the sun.
69. Energy is required for a variety of life processes
d. carbon dioxide.
including
a. growth and reproduction.
72. The process whereby plants capture energy and
b. movement.
make complex molecules is known as
c. transport of certain materials across cell
a. homeostasis.
membranes.
b. evolution.
d. All of the above
c. photosynthesis.
d. development.
73. photosynthesis : oxygen ::
a. respiration : darkness
b. light reactions : dark reactions
c. respiration : carbon dioxide
d. oxygen : carbon dioxide
74. The sun is considered the ultimate source of energy
for life on Earth because
a. all organisms carry out photosynthesis.
b. all organisms carry out cellular respiration.
c. either photosynthetic organisms or organisms
that have eaten them provide energy for all
other organisms on Earth.
d. the sun heats Earth’s atmosphere.
75. The role of chlorophyll in photosynthesis is to
a. absorb light energy.
b. pass electrons to carotenoids.
c. split water molecules.
d. All of the above
76. Chlorophyll is green because
a. it absorbs green wavelengths of light.
b. it absorbs blue and yellow wavelengths, which
make green.
c. it reflects green wavelengths of light.
d. it transmits light and causes an optical illusion.
77. The major atmospheric byproduct of photosynthesis
is
a. nitrogen.
b. carbon dioxide.
c. water.
d. oxygen.
78. Refer to the illustration above. Graph 1
c. NADPH.
demonstrates that the rate of photosynthesis
d. oxygen.
a. decreases in response to increasing light
81. When muscles are exercised extensively in the
intensity.
absence of sufficient oxygen,
b. increases indefinitely in response to increasing
a. a large amount of ATP is formed.
light intensity.
b. NADH molecules split.
c. increases in response to increasing light
c. lactic acid is produced.
intensity, but only to a certain point.
d. cellular respiration ceases.
d. is unaffected by changes in light intensity.
82. You have been growing some animal cells in
79. ATP
culture. The cells grow well for several weeks, and
a. contains five phosphate groups.
then their growth slows down. You conduct some
b. is essential for a cell to perform all the tasks
tests and determine that there is a lot of lactic acid
necessary for life.
in the culture fluid. Which of the following is the
c. is found only in bacteria.
most likely explanation for the poor growth of the
d. All of the above
cells?
80. A substance produced during photosynthesis that is
a. There is too much glucose in the culture fluid.
used for completion of cellular respiration is
b. There is not enough glucose in the culture fluid.
a. water.
c. There is too much oxygen in the culture fluid.
b. ATP.
d. There is not enough oxygen in the culture fluid.
C6 H12O6 + 6O2 + ADP + P  6CO2 + 6 H2O + MOLECULE A
83. The equation above summarizes the process known
b. fermentation.
as
c. cellular respiration.
a. photosynthesis.
d. protein breakdown.
84. The molecule referred to as “molecule A” in the
equation above is
a. NADPH.
b. ATP.
c. NADH.
d. ADP.
85. Which of the following is the best explanation for
the presence of both chloroplasts and mitochondria
in plant cells?
a. In the light, plants are photosynthetic
autotrophs. In the dark, they are heterotrophs.
b. If plants cannot produce enough ATP in the
process of photosynthesis to meet their energy
needs, they can produce it in aerobic
respiration.
c. Sugars are produced in chloroplasts. These
sugars can be stored in the plant for later use,
converted to other chemicals, or broken down
in aerobic respiration to yield ATP for the plant
to use to meet its energy needs.
d. The leaves and sometimes the stems of plants
contain chloroplasts, which produce ATP to
meet the energy needs of these plant parts. The
roots of plants contain mitochondria, which
produce ATP to meet the energy needs of these
86.
87.
88.
89.
plant parts.
diploid : body cell :: haploid :
a. sex chromosome
b. chromosome
c. reproductive cell
d. zygote
The diploid number of chromosomes in a human
skin cell is 46. How many chromosomes are in a
human egg cell?
a. 46
b. 92
c. 23
d. 12.5
How many chromosomes are in the body cells of an
organism that has a haploid number of 8?
a. 4
b. 8
c. 12
d. 16
Binary fission
a. occurs when two cells collide with each other.
b. produces excess energy.
c. creates new species.
d. is the process by which bacteria reproduce.
90. Refer to the illustration above. The cell shown in
diagram 5 is in
a. metaphase.
b. telophase.
c. anaphase.
d. prophase.
91. A typical human cell contains 46 chromosomes.
After mitosis and cytokinesis, each of the two new
cells formed from the original cell
a. has 23 chromosomes.
b. grows new chromosomes from existing DNA.
c. has a complete set of 46 chromosomes.
d. None of the above
Diagrams 1 and 2 show cells from an organism with a diploid chromosome number of 4.
92. Refer to the illustration above. Which of the cells will be a diploid cell at the completion of division?
a. 1
c. Both
b. 2
d. Neither
Problem
93. A living cell has certain characteristics in common with a working factory. In a factory, products are assembled
according to specified plans, energy is used in the assembly process, products are packaged and taken out of the
factory, and a supervisor directs and oversees all of the activities occurring in the factory. Draw a model of a
factory, labeling areas where the following important activities would occur: main office where supervisor keeps
the plans and oversees activities, assembly line, electricity generator, packaging center, and factory doors. Next to
each of your labels, write the name of the cellular organelle or structure that has a similar function. Choose the
cellular organelles and structures from this list: nucleus, cytoplasm, cell membrane, mitochondrion, endoplasmic
reticulum, Golgi apparatus, vacuole. Write your answer in the space below.
Essay
94. The results of an experiment do not support the
hypothesis that the experiment was designed to test.
Was the experiment a waste of time? Explain.
Write your answer in the space below.
95. Distinguish facilitated diffusion from active
transport. Write your answer in the space below.
96. Define the terms autotroph and heterotroph. What
types of organisms belong in each of these
categories? Write your answer in the space below.
97. The relationship between photosynthesis and
cellular respiration is usually described as a cycle.
Briefly explain. Write your answer in the space
below.
98. Briefly describe the five stages of the cell cycle.
Write your answer in the space below.
99. Explain how offspring resulting from sexual
reproduction differ from offspring resulting from
asexual reproduction.
100. A great deal of research on the causes of and a
possible cure for cancer focuses on mitosis. Why?
Write your answer in the space below.
Semester 1 Exam
Answer Section
MULTIPLE CHOICE
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B
ST.2
C
LS.15 | LS.24
C
LS.1
B
LS.3
D
LS.15
C
LS.4
D
LS.4
D
SI.4
B
SWK.3
B
SWK.3
A
SWK.3
A
SWK.3
D
SWK.2
C
SWK.3
B
A
SI.1
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SWK.2
D
C
A
C
C
A
B
B
PTS: 1
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OBJ: 1-1.1
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OBJ: 1-1.5
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PTS: 1
DIF: 1
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PTS: 1
DIF: 1
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OBJ: 1-3.3
PTS: 1
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OBJ: 1-3.5
PTS: 1
DIF: 2
OBJ: 1-3.6
PTS: 1
DIF: 1
OBJ: 1-3.1
PTS: 1
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D
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LS.11
D
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LS.1 | LS.11
B
PTS:
LS.1 | LS.11
C
PTS:
LS.1 | LS.11
A
PTS:
LS.1 | LS.11
C
PTS:
LS.1 | LS.11
B
PTS:
LS.1 | LS.11
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PTS:
LS.1 | LS.11
D
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LS.1 | LS.11
B
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LS.1 | LS.11
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LS.5
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LS.3
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LS.1 | LS.11
B
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LS.11
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LS.27
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PTS:
LS.1 | LS.1 | LS.27
B
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LS.2
C
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LS.2
B
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LS.2
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LS.2
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LS.2
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LS.2
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2-1.4
2-3.1
3-1.2
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LS.2
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LS.2
B
LS.2
B
LS.2
B
LS.2
A
LS.2
B
LS.2
C
LS.2
D
LS.2
D
LS.2
D
LS.4
B
LS.3
D
LS.3
D
LS.3
B
LS.3
B
LS.3
D
LS.1
C
LS.1
C
LS.1
C
LS.1
C
LS.1
C
LS.1
A
LS.1
PTS: 1
DIF: 1
OBJ: 4-3.3
PTS: 1
DIF: 1
OBJ: 4-3.3
PTS: 1
DIF: 1
OBJ: 4-3.2
PTS: 1
DIF: 2
OBJ: 4-2.4
PTS: 1
DIF: 2
OBJ: 4-3.2
PTS: 1
DIF: 2
OBJ: 4-4.1
PTS: 1
DIF: 1
OBJ: 4-4.1
PTS: 1
DIF: 1
OBJ: 4-4.4
PTS: 1
DIF: 1
OBJ: 4-4.4
PTS: 1
DIF: 1
OBJ: 4-4.3
PTS: 1
DIF: 1
OBJ: 4-4.1
PTS: 1
DIF: 1
OBJ: 4-2.5
PTS: 1
DIF: 1
OBJ: 5-1.1
PTS: 1
DIF: 2
OBJ: 5-1.2
PTS: 1
DIF: 2
OBJ: 5-1.1
PTS: 1
DIF: 1
OBJ: 5-2.3
PTS: 1
DIF: 1
OBJ: 5-2.3
PTS: 1
DIF: 1
OBJ: 6-1.1
PTS: 1
DIF: 1
OBJ: 6-1.1
PTS: 1
DIF: 1
OBJ: 6-1.1
PTS: 1
DIF: 1
OBJ: 6-1.1
PTS: 1
DIF: 2
OBJ: 6-1.1
PTS: 1
DIF: 1
OBJ: 6-1.1
PTS: 1
DIF: 1
OBJ: 6-1.2
76. ANS:
STA:
77. ANS:
STA:
78. ANS:
STA:
79. ANS:
STA:
80. ANS:
STA:
81. ANS:
STA:
82. ANS:
STA:
83. ANS:
STA:
84. ANS:
STA:
85. ANS:
STA:
86. ANS:
87. ANS:
88. ANS:
89. ANS:
STA:
90. ANS:
STA:
91. ANS:
STA:
92. ANS:
STA:
C
LS.1
D
LS.1
C
LS.1
B
LS.1
D
LS.1
C
LS.1
D
LS.1
C
LS.1
B
LS.1
C
LS.1
C
C
D
D
LS.4
B
LS.4
C
LS.4
A
LS.11
PTS: 1
DIF: 1
OBJ: 6-1.2
PTS: 1
DIF: 1
OBJ: 6-1.3
PTS: 1
DIF: 2
OBJ: 6-2.5
PTS: 1
DIF: 1
OBJ: 7-1.1
PTS: 1
DIF: 1
OBJ: 7-1.1
PTS: 1
DIF: 1
OBJ: 7-1.3
PTS: 1
DIF: 3
OBJ: 7-1.3
PTS: 1
DIF: 2
OBJ: 7-1.1
PTS: 1
DIF: 2
OBJ: 7-1.1
PTS: 1
DIF: 3
OBJ: 7-2.1
PTS:
PTS:
PTS:
PTS:
DIF:
DIF:
DIF:
DIF:
OBJ:
OBJ:
OBJ:
OBJ:
1
1
1
1
1
1
1
1
8-1.5
8-1.5
8-1.5
8-2.1
PTS: 1
DIF: 2
OBJ: 8-2.4
PTS: 1
DIF: 1
OBJ: 8-2.2
PTS: 1
DIF: 2
OBJ: 8-3.1
PROBLEM
93. ANS:
The drawing should include the following pairs:
main office—nucleus
assembly line—endoplasmic reticulum
electricity generator—mitochondrion
packaging center—Golgi apparatus
factory doors—plasma membrane
PTS: 1
ESSAY
94. ANS:
DIF: 3
OBJ: 4-3.3
STA: LS.2
No, the experiment was not a waste of time. A scientist works by systematically showing that certain hypotheses
are not valid when they are not consistent with the results of experiments. The results of experiments are used to
evaluate alternative hypotheses. An experiment can be successful if it shows that one or more of the alternative
hypotheses are inconsistent with observations.
PTS: 1
DIF: 2
OBJ: 1-3.2
STA: SWK.3
95. ANS:
Protein channels that assist the diffusion of substances through the cell membrane do so by facilitated diffusion.
Facilitated diffusion works in two directions. As long as a molecule or ion fits into the channel, it is free to pass
through in either direction. Each kind of molecule or ion diffuses toward the side where it is least concentrated,
eventually balancing the concentrations. Active transport, on the other hand, allows ions to move through the cell
membrane in one direction only, like a turnstile at a subway station. Active transport enables a cell to stockpile
certain substances in far greater concentrations than they occur outside the cell. Almost all active transport in cells
is carried out by the sodium-potassium pump.
PTS: 1
DIF: 2
OBJ: 5-2.1
STA: LS.3
96. ANS:
Organisms that acquire energy by making their own food are called autotrophs. Plants and certain unicellular
organisms are autotrophs. Organisms that gain energy by eating other organisms are called heterotrophs. Some
unicellular organisms, as well as all animals and fungi, are heterotrophs.
PTS: 1
DIF: 2
OBJ: 6-1.1
STA: LS.1
97. ANS:
The relationship between photosynthesis and cellular respiration is often described as cyclic because the products
of one process are used as the reactants for the other. Photosynthesis produces carbohydrates from carbon dioxide
and water, incorporating light energy into the bonds of glucose. Cellular respiration, on the other hand, releases
energy from the bonds of glucose for use by the cell, and in the process produces carbon dioxide and water.
PTS: 1
DIF: 2
OBJ: 7-1.1
STA: LS.1
98. ANS:
The G1 stage of the cell cycle is the phase of cell growth. This is followed by the S stage, during which DNA is
copied. G2 involves the cell preparing for cell division. The M phase is when mitosis occurs. The cell cycle
concludes with cytokinesis. The newly formed cells then enter into a new cell cycle, repeating these stages.
PTS: 1
DIF: 2
OBJ: 8-2.3
STA: LS.4
99. ANS:
Offspring from sexual reproduction have two parents. They were produced through meiosis and fertilization. They
are genetically different from either parent but have similarities to both. Offspring from asexual reproduction arise
through mitosis in one parent. They are identical genetically to that parent.
PTS: 1
DIF: 2
OBJ: 8-3.6
STA: LS.11
100. ANS:
Cancer is a disease in which cells grow and undergo mitosis at an abnormally high rate. If the causes of
uncontrolled mitosis of cancerous cells could be determined, perhaps cancer could be slowed or cured.
PTS: 1
DIF: 2
OBJ: 8-2.6
STA: LS.4