Why is the synthesis stage called this?

because DNA synthesis is taking place

By the end of prophase, each of the following has occurred except ______.

lining up of chromosomes in the cell

Living things do all of the following except ______.

pass an identical genetic code to their offspring for many generations

A stem cell has potential medical uses because it _____.

is not specialized in structure and function

Which of these has occurred by the end of prophase?

the nuclear membrane has disappeared

Which is the result of smooth endoplasmic reticulum being damaged in liver cells by excess alcohol consumption?

inability to detoxify harmful substances

What types of materials are expelled from cells during exocytosis?

large molecules such as hormones

Which statement is a fundamental principle of the cell theory?

living organisms are composed of cells

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Biology Final

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Questions 87

Answers

1
Which of the following are likely topics in a biology course?
Why does the Texas horned lizard squirt blood out of its eyes?
what chemicals cause plant stems to lengthen or flowers to bloom?
How is a banded pipefish able to hide in its environment of seaweeds?
all of these
2
In an experiment, the condition being changed by the scientist is called the dependent variable.
False
True
3
The part of the cell that regulates what enters and leaves the cell is the ______.
cell membrane
nuclear envelope
nucleus
cytoplasm
4
Why is the synthesis stage called this?
because it combines several smaller stages into one
because the chromosomes come together
because protein synthesis is taking place
because DNA synthesis is taking place
5
A cell has 12 chromosomes. How many chromosomes will each daughter cell have?
12
6
24
4
6
Which is an example of a chemical reaction?
ice melting
sugar dissolving in water
iron rusting
water evaporating
7
In humans and other multicellular organisms, which substance plays a central role as an energy source?
fat
carbohydrate
water
protein
8
What did scientists observe using the earliest microscopes?
molecules
atoms
tiny organisms
cell parts
9
The site where photosynthesis occurs is the ______.
flagella
cilia
vacuole
chloroplast
10
Which of the following is not a characteristic of life?
displays organization
responds to stimuli
requires energy
breathes oxygen
11
A gamete has one-half the number of chromosomes of a regular body cell.
False
True
12
A single carbon atom can form a maximum of how many single covalent bonds?
8
6
4
2
13
By the end of prophase, each of the following has occurred except ______.
disappearing of the nucleolus
breaking down of the nuclear envelope
tighter coiling of the chromsomes
lining up of chromosomes in the cell
14
In the peer-review process for a report on the results of the ecology of honeybees, who would be an appropriate reviewer
a physicist that keeps bees
a politician that knew about bees
a biologist studying insects
a university president
15
______ represents a formula for a chemical compound.
P
C
H
H2O
16
A hydrogen bond can form between a hydrogen atom of one molecule which atom of another molecule?
hydrogen
sodium
carbon
oxygen
17
Which particle in the nucleus of an atom has a neutral charge?
carbon
electron
neutron
proton
18
What is cancer caused by?
cell-membrane
mutation
metabolic poisoning
immune-system damage
19
In the periodic table of the elements, elements in Group 1 have how many outer electrons?
8
00
1
4
20
Glycogen, used to store energy in the liver an muscle tissue, is an example of which type of molecule?
steroid
saturated fatty acid
carbohydrate
protein
21
Living things do all of the following except ______.
respond to other organisms
make adustments to nonliving factors around them
pass an identical genetic code to their offspring for many generations
maintain a steady internal environment
22
Which is the negatively charged particle located outside the nucleus of an atom?
neutron
silicon
electron
proton
23
A stem cell has potential medical uses because it _____.
is sinilar to a cancer cell, providing a study system
undergoes mitosis
is not specialized in structure and function
undergoes apotosis
24
Which organelles are only found in animals?
mitochondria
golgi apparatus
lysosomes
ribosmes
25
Amino acids are the building blocks of which macromolecule?
protein
DNA
lipid
carbohydrate
26
If homozygous dominant crosses with homozygous recessive how many of their 8 offspring will be recessive?
6
3
8
0
27
If something has five of the seven characteristics of life, it is considered an organism.
False
True
28
Which of these has occurred by the end of prophase?
the spindle is beiginning to form
the nuclear membrane has disappeared
sister chromatids are separated
the cell membrane has begun to pinch inward
29
A cell that undergoes repeated mitosis without cytokinesis would have _____.
many nuclei
cancerous properties
many daughter cells
fewer chromosmes
30
The total number of atoms in a molecule of sucrose, C₁₂H₂₂O_11,is ________.
22
12
11
45
31
Which organelle is NOT found in a plant cell?
ribosomes
nucleus
flagella
mitochondria
32
Of the following species used in agriculture, which is most likely a polyploid?
goat
cow
wheat
hen
33
Which is the result of smooth endoplasmic reticulum being damaged in liver cells by excess alcohol consumption?
excessive breakdown of carbohydrates
difficulty with protein synthesis
absorption of excess water
inability to detoxify harmful substances
34
Which of the following is an example of passive transport?
Na+K+ ATPase pump
endocytosis
exocytosis
facilitated diffusion
35
What types of materials are expelled from cells during exocytosis?
large molecules such as hormones
positive and negative ions
small molecules such as carbon dioxide
water and glycerol
36
Which is present only in eukaryotic cells?
chromosmes
cell membrane
DNA
nucleus
37
An atom of fluorine has nine electrons. It's second energy level has ______.
eight electrons
nine electrons
two electrons
seven electrons
38
A single covalent bond forms when two atoms do which of these?
when they share one electron
when one gives an electron to the other
when they share two electrons
when one gives two electrons to the other
39
Which statement is a fundamental principle of the cell theory?
Eukaryotic cells are larger than prokaryotic cells
all cells have a plasma membrane
the genetic material in cells is DNA.
living organisms are composed of cells
40
Molecules that have an unequal distribution of charges are called ______ molecules.
catalyst
nonpolar
homogeneous
polar
41
The regulation of an organism's internal conditions to maintain life is referred to as______.
forensics
homeostasis
organization
exocytosis
42
A heterozygous organism is best described as which of these?
genotype
true-breeding
hybrid
dominat
43
Which is NOT something a scientist would study?
astrology
biology
anatomy
botany
44
A plant cell is placed in a hypotonic solution. What will happen to the plant cell?
it will stay the same
it will swell
it will wilt
it will shrink
45
If two heterozygous individuals are crossed, what percent of their offspring are also expected to be heterozygous?
50
100
0
75
46
The organelle that makes energy available for the cell is the _____.
nucleolus
chromsome
nuclear envelope
mitochondria
47
Meiosis results in _____.
2 diploid cells
4 diploid cells
4 haploid cells
2 haploid cells
48
What would a scientist do with new information that conflicts with previous findings on their study?
keep the new information to himself
evaluate the new information
argue against the new information
ignore the new information
49
Which substance has at least one ionic bond?
H2O
NaCl
CH4
O2
50
Cells benefit from a high ratio of surface area to volume.
False
True
51
During which phase of meiosis do homologous pairs of chromosomes line up next to each other along the equator?
metaphase II
anaphase I
prophase II
metaphase I
52
Which is the occurrence of accidental or unexpected, but fortunate, results?
serendipidity
observation
inference
hypothesis
53
Stem cells are only of one type: embryonic
True
False
54
The typical human body cell contains 46 chromosomes. How many chromosomes are found in a typical human sperm?
46
45
92
23
55
The _______ modifies, sorts, and packages proteins.
mitochondrion
ribosomes
golgi appartatus
vacuole
56
Which property is responsible for the fact that water and oil do not mix?
mass
phase
polarity
density
57
How do the isotopes of hydrogen differ?
the number of protons
the number of energy levels
the number of neutrons
the number of electrons
58
The cell cycle is divided into interphase and mitosis.
True
False
59
An organism's genetic information is stored in which type of macromolecule?
protein
lipid
DNA
carbohydrate
60
Which beverage is the best example of a colloid?
black coffee
tea
milk
root beer
61
Which element is found in proteins but not carbohydrates or lipids?
C
O
H
N
62
A molecule of water (H₂O) has which bonds?
1 covalent bond
2 ionic bonds
1 ionic bond
2 covalent bonds
63
What is a major difference between facilitated diffusion and active transport?
facilitated diffusion requires large amounts of energy
facilitated diffusion moves molecules through the plasma membrane
active transport moves substances against the concentration gradient
active transport uses proteins in the process
64
Which best describes the purpose of science?
to solve the ethical problems of society
to debate the meaning of life
to explain the nature of things
to propose solutions to political issues
65
The cell is regulated by ______
cyclins
sugars
enzymes
hormones
66
A(n) ________ is a testable explanation of a situation.
homeostasis
hypothesis
inference
peer review
67
A(n) _______________ is any inherited characteristic that results from changes to a species over time.
adaptation
growth
gene
stimulus
68
The movement of water molecules across a membrane is known as _______.
osmosis
endocytosis
diffusion
pinocytosis
69
The rough endoplasmic reticulum is involved in the synthesis of _____.
lipids
proteins
sugars
starches
70
Which organelle converts sugars into energy?
ribosome
nucleus
mitochondrion
lysosome
71
Which is the best example of a solution?
seawater
paint
blood
milk
72
At what point in the process of diffusion is dynamic equilibrium reached?
when there is continuous movement but no change
when the rate of change in the solution slows by one half
when the molecules are mixed and stop moving
when the movement of the molecules stops being random
73
What is the role of the spindle fibers?
to store nucleotides prior to DNA synthesis
to move chromsosmes in the cell
to intiate the formation of the nuclear membrance
to join homologous chromosomes together
74
Crossing over would most likely occur during which stage of the cell cycle?
when homologous chromosomes line up in pairs
when cytokinesis begins
when DNA is being replicated
when centromeres are separated
75
Which of the following does not occur as a cell grows larger and larger in size?
ratio of surface area to volume increases
difficulty obtaining nutrients
difficulty eliminating wastes
diffusion across the cell membrane is impaired
76
What is the role of cyclin-dependent kinases in the cell cycle?
they provide the energy for the actions of the spindle fibers
they catalyze the condensation of the chromosomes
they stop the cycle if something has gone wrong
they initiate various stages of the cell cycle
77
The metric system uses units with divisions that are powers of _____.
twenty
twenty-five
one
ten
78
Which is the best description of activation energy?
heat released as the reaction proceeds
heat stored within the reactant molecules
heat stored within the product molecules
heat added to initiate a reaction
79
DNA replication occurs during ______.
anaphase
metaphase
interphase
prophase
80
The basic units from which cell membranes are constructed are _____
free-moving proteins
lipid bilayers
protein pumps
carbohydrate gates
81
If a cell has a cytoskeleton, mitochondrion, nucleus, cell wall, and ribosomes what kind of organism would it be?
bacteria
none of the above
plant
animal
82
Which event during meiosis leads to a reduction in chromosome number from 2n to n?
DNA undergoes replication
homologous chromsomes travel to opposite sides of the cell
sister chromatids are pulled apart at the centromere.
pairs of chromosomes line up at the equator
83
Which of the following is the correct sequence of the organizational levels from least complex to most complex?
tissue, cell, organ, organ system, organism
cell, organ, tissue, organ system, organism
organ, cell, tissue, organ system, organism
cell, tissue, organ, organ system
84
Prokaryotes divide by binary fission, a form of asexual reproduction in which __________.
a cell divides into two cells with identical genetic information
the number of chromosomes in the cell is reduced
the nucleus divides into two nuclei
spindle fibers attach to the poles of the cell
85
When paper burns in a fire, what is one reactant?
oxygen
fire
water
carbon dioxide
86
Which of the following is an observation?
you conclude that the season is changing
you hypothesize that the temperature will increase tomorrow
you propose that a cold front is approaching
you record the air temperature every day for a week
87
Which is an inference?
You give a plant the same amount of water every day
you measure a plant's height every day for a week
every day for a week, you colllect data on a plant's movement.
after watching a plant for a week, you determine it needs more sunlight

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