The types of ' + 'particles that are located in the nucleus of an atom are protons and neutrons, and the types of ' + 'particles that are located in the energy levels surrounding the nucleus are electrons.
'; answerText[0] = '
T
'; numberText[1] = '2.'; questionText[1] = '
The atomic ' + 'number of carbon is 6, so it must contain 12 electrons.
'; answerText[1] = '
F
'; numberText[2] = '3.'; questionText[2] = '
Most elements ' + 'are stable if their outermost energy level contains an even number of electrons.
'; answerText[2] = '
F
'; numberText[3] = '4.'; questionText[3] = '
Atoms in a ' + 'gas move more rapidly than atoms in a liquid or a solid do.
'; answerText[3] = '
T
'; numberText[4] = '5.'; questionText[4] = '
The products ' + 'of an endergonic chemical reaction possess more energy than the reactants from which they are ' + 'produced.
'; answerText[4] = '
T
'; numberText[5] = '6.'; questionText[5] = '
The amount ' + 'of energy needed to cause a chemical reaction to start is called activation energy.
'; answerText[5] = '
T
'; numberText[6] = '7.'; questionText[6] = '
When an enzyme ' + 'binds with its substrate, the activation energy needed for the chemical reaction to occur is ' + 'raised.
'; answerText[6] = '
F
'; numberText[7] = '8.'; questionText[7] = '
Enzymes speed up a chemical reaction by increasing the activation energy of the ' + 'reaction.
'; answerText[7] = '
F
'; numberText[8] = '9.'; questionText[8] = '
Free hydrogen ' + 'ions can react with water molecules and form a positively charged ion, the hydronium ' + 'ion.
'; answerText[8] = '
T
'; numberText[9] = '10.'; questionText[9] = '
Buffers can neutralize acids, but they do not affect bases.
'; answerText[9] = '
F
'; numberText[10] = '11.'; questionText[10] = '
The smallest ' + 'particle of matter that can retain the chemical properties of carbon is
a.
a carbon molecule.
c.
a carbon atom.
b.
a carbon macromolecule.
d.
an element.
'; answerText[10] = '
C
'; numberText[11] = '12.'; questionText[11] = '
The bond formed ' + 'when two atoms share a pair of electrons is called a
a.
hydrogen bond.
c.
covalent bond.
b.
nonpolar bond.
d.
water bond.
'; answerText[11] = '
C
'; numberText[12] = '13.'; questionText[12] = '
Sharing of electrons in the outer energy levels of two atoms
a.
results in ion formation.
b.
occurs in covalent bonds.
c.
only occurs if both are atoms of the same ' + 'element.
d.
is found only ' + 'among carbon atoms.
'; answerText[12] = '
B
'; numberText[13] = '14.'; questionText[13] = '
An atom that ' + 'has gained or lost electrons is called a(n)
a.
molecule.
c.
ion.
b.
nucleon.
d.
element.
'; answerText[13] = '
C
'; numberText[14] = '15.'; questionText[14] = '
Which of the ' + 'following statements most accurately describes the difference between an ionic bond and a covalent ' + 'bond?
a.
Atoms held together by ionic bonds separate when placed in water while ' + 'atoms held together by covalent bonds do not separate in water.
b.
Ionic bonds hold together atoms of two different types, while covalent ' + 'bonds hold together atoms of the same type.
c.
Electrons are exchanged between atoms held together by an ionic bond, ' + 'but they are shared between atoms held together by a covalent bond.
d.
Ionic bonds form between atoms that carry opposite charges, while ' + 'covalent bonds form between uncharged atoms.
'; answerText[14] = '
C
'; numberText[15] = '16.'; questionText[15] = '
A reaction ' + 'in which the products have less energy than the reactants is
a.
an endergonic reaction.
c.
a filamentous reaction.
b.
an exergonic reaction.
d.
impossible.
'; answerText[15] = '
B
'; numberText[16] = '17.'; questionText[16] = '
Refer to the ' + 'graph above. Reaction “1” in the graph
a.
is an energy-storing reaction.
b.
requires a greater activation energy than Reaction ' + '“2.”
c.
may use the same ' + 'initial reactant condition needed to form Product “B.”
d.
All of the above
'; answerText[16] = '
D
'; numberText[17] = '18.'; questionText[17] = '
Refer to the ' + 'graph above. Which of these statements is true regarding the graph?
a.
Reaction “2” occurs faster than Reaction “3” ' + 'because Reaction “2” requires more energy than Reaction ' + '“3.”
b.
The difference in ' + 'the graphs shown for Reaction “2” and Reaction “3” is due to a difference in the ' + 'activation energy needed for these reactions.
c.
Reactant “A” contains more energy at the beginning of the ' + 'reaction than Product “C” has after the reaction.
d.
All of the above
'; answerText[17] = '
B
'; numberText[18] = '19.'; questionText[18] = '
Changing the course or pathway of a chemical reaction so that it requires less ' + 'activation energy
a.
is a violation of the laws of nature.
b.
requires higher temperatures than those found within ' + 'cells.
c.
occurs only when ' + 'reactants are quickly added to the reaction mixture.
d.
is accomplished by the action of catalysts on ' + 'reactants.
'; answerText[18] = '
D
'; numberText[19] = '20.'; questionText[19] = '
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.
'; answerText[19] = '
A
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} // -->
Name:
Chemistry Quiz
True/False
Indicate whether the sentence or statement is true or false.
1.
The types of particles that are located in the nucleus of an atom are protons and neutrons, and the types of particles that are located in the energy levels surrounding the nucleus are electrons.
2.
The atomic number of carbon is 6, so it must contain 12 electrons.
3.
Most elements are stable if their outermost energy level contains an even number of electrons.
4.
Atoms in a gas move more rapidly than atoms in a liquid or a solid do.
5.
The products of an endergonic chemical reaction possess more energy than the reactants from which they are produced.
6.
The amount of energy needed to cause a chemical reaction to start is called activation energy.
7.
When an enzyme binds with its substrate, the activation energy needed for the chemical reaction to occur is raised.
8.
Enzymes speed up a chemical reaction by increasing the activation energy of the reaction.
9.
Free hydrogen ions can react with water molecules and form a positively charged ion, the hydronium ion.
10.
Buffers can neutralize acids, but they do not affect bases.
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
11.
The smallest particle of matter that can retain the chemical properties of carbon is
a.
a carbon molecule.
c.
a carbon atom.
b.
a carbon macromolecule.
d.
an element.
12.
The bond formed when two atoms share a pair of electrons is called a
a.
hydrogen bond.
c.
covalent bond.
b.
nonpolar bond.
d.
water bond.
13.
Sharing of electrons in the outer energy levels of two atoms
a.
results in ion formation.
b.
occurs in covalent bonds.
c.
only occurs if both are atoms of the same element.
d.
is found only among carbon atoms.
14.
An atom that has gained or lost electrons is called a(n)
a.
molecule.
c.
ion.
b.
nucleon.
d.
element.
15.
Which of the following statements most accurately describes the difference between an ionic bond and a covalent bond?
a.
Atoms held together by ionic bonds separate when placed in water while atoms held together by covalent bonds do not separate in water.
b.
Ionic bonds hold together atoms of two different types, while covalent bonds hold together atoms of the same type.
c.
Electrons are exchanged between atoms held together by an ionic bond, but they are shared between atoms held together by a covalent bond.
d.
Ionic bonds form between atoms that carry opposite charges, while covalent bonds form between uncharged atoms.
16.
A reaction in which the products have less energy than the reactants is
a.
an endergonic reaction.
c.
a filamentous reaction.
b.
an exergonic reaction.
d.
impossible.
17.
Refer to the graph above. Reaction “1” in the graph
a.
is an energy-storing reaction.
b.
requires a greater activation energy than Reaction “2.”
c.
may use the same initial reactant condition needed to form Product “B.”
d.
All of the above
18.
Refer to the graph above. Which of these statements is true regarding the graph?
a.
Reaction “2” occurs faster than Reaction “3” because Reaction “2” requires more energy than Reaction “3.”
b.
The difference in the graphs shown for Reaction “2” and Reaction “3” is due to a difference in the activation energy needed for these reactions.
c.
Reactant “A” contains more energy at the beginning of the reaction than Product “C” has after the reaction.
d.
All of the above
19.
Changing the course or pathway of a chemical reaction so that it requires less activation energy
a.
is a violation of the laws of nature.
b.
requires higher temperatures than those found within cells.
c.
occurs only when reactants are quickly added to the reaction mixture.
d.
is accomplished by the action of catalysts on reactants.
20.
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.
All chordates have a notochord, dorsal nerve cord, pharyngeal pouches, & postanal tail at some time in their life
Notochord is a firm, flexible rod of tissue located on the dorsal side of the body that becomes part of the endoskeleton in vertebrates
Dorsal nerve cord is a hollow tube lying dorsal to the notochord that becomes the brain & spinal cord in vertebrates
Pharyngeal pouches are small outpockets of the anterior part of the digestive tract that become gills in aquatic chordates & jaws, inner ear, & tonsils in terrestrial chordates
Postanal tail consists of muscle tissue & lies behind the posterior opening of the digestive tract
Subphyla of Chordates
The Phylum Chordata includes all of the vertebrates, as well as two groups of marine animals that lack backbones and are called invertebrate chordates
The phylum is divided into three subphyla, determined by the development of the notochord
Subphylum Cephalochordata contains about 24 species of blade-shaped animals known as lancelates that retain the notochord, dorsal nerve chord, pharyngeal pouches, and postanal tail throughout their life
Subphylum Urochordata contains 2,000 species commonly called tunicates because their bodies are covered by a tough covering, or tunic
* Called sea squirts because they shoot out a stream of water when touched
*Sessile, barrel-shaped, filter feeding animals that live on the sea bottom
*Adults have a pouch-like pharynx with slits
*Adults do not have a notochord, dorsal nerve cord, or postanal tail
Subphylum Vertebrata is the largest subphylum in which the notochord is replaced with vertebrae
* Skeletons consist of bone &/or cartilage
* Brain is protected by a cranium
* Well developed 4 chambered heart with a closed circulatory system
* Includes fish, amphibians, reptiles, birds, & mammals
Cells within ' + 'a tissue carry out a common function.
'; answerText[3] = '
T
'; numberText[4] = '5.'; questionText[4] = '
The ribosome ' + 'is the site of protein synthesis within a cell.
'; answerText[4] = '
T
'; numberText[5] = '6.'; questionText[5] = '
A unicellular ' + 'organism is at a disadvantage when compared to a multicellular organism because a unicellular ' + 'organism is unable to perform all life functions that a multicellular organism can.
'; answerText[5] = '
F
'; numberText[6] = '7.'; questionText[6] = '
Cell membranes ' + 'are totally permeable.
'; answerText[6] = '
F
'; numberText[7] = '8.'; questionText[7] = '
As a cell gets ' + 'larger, its volume increases at a faster rate than its surface area.
'; answerText[7] = '
T
'; numberText[8] = '9.'; questionText[8] = '
ATP is produced ' + 'primarily in mitochondria.
'; answerText[8] = '
T
'; numberText[9] = '10.'; questionText[9] = '
The only difference ' + 'between a plant cell and an animal cell is that plant cells have chloroplasts.
'; answerText[9] = '
F
'; numberText[10] = '11.'; questionText[10] = '
Which of the ' + 'following is not a function both multicellular and unicellular organisms can ' + 'perform?
a.
coordinate the activities of organs
c.
produce other cells
b.
synthesize new living material
d.
regulate water balance
'; answerText[10] = '
A
'; numberText[11] = '12.'; questionText[11] = '
Structures that support and give shape to cells are
a.
Golgi bodies
c.
basal bodies
b.
microtubules
d.
chloroplasts
'; answerText[11] = '
B
'; numberText[12] = '13.'; questionText[12] = '
Which of the ' + 'following functions are performed by both multicellular and unicellular organisms?
a.
regulating water balance
c.
producing other cells
b.
reacting to changes in the environment
d.
all of these
'; answerText[12] = '
D
'; numberText[13] = '14.'; questionText[13] = '
What structures ' + 'are associated with cell division?
a.
mitochondria
c.
Golgi bodies
b.
chloroplasts
d.
centrioles
'; answerText[13] = '
D
'; numberText[14] = '15.'; questionText[14] = '
A complex network ' + 'of membranes lying between the nuclear membrane and the cell membrane is
the
a.
mitochondria
c.
cristae
b.
chromosomes
d.
endoplasmic ' + 'reticulum
'; answerText[14] = '
D
'; numberText[15] = '16.'; questionText[15] = '
A particularly ' + 'active cell might contain large amounts of
a.
chromosomes.
c.
mitochondria.
b.
vacuoles.
d.
walls.
'; answerText[15] = '
C
'; numberText[16] = '17.'; questionText[16] = '
The cell membrane
a.
allows all substances to pass into and out of the ' + 'cell
c.
is composed mainly of a protein ' + 'bilayer
b.
prevents all ' + 'substances from passing into and out of the cell
d.
is composed mainly of a lipid bilayer
'; answerText[16] = '
D
'; numberText[17] = '18.'; questionText[17] = '
Sometimes these organelles are attached to the endoplasmic reticulum to form rough ' + 'ER
a.
chloroplasts
c.
mitochondria
b.
ribosomes
d.
centrioles
'; answerText[17] = '
B
'; numberText[18] = '19.'; questionText[18] = '
One difference ' + 'between prokaryotes and eukaryotes is that
a.
nucleic acids are found only in prokaryotes.
b.
mitochondria are found in larger quantities in ' + 'eukaryotes.
c.
Golgi vesicles are ' + 'found only in prokaryotes.
d.
prokaryotes have no nuclear membrane.
'; answerText[18] = '
D
'; numberText[19] = '20.'; questionText[19] = '
Cigar-shaped bodies in the cytoplasm known as centers of ATP production ' + 'are
a.
Golgi bodies
c.
ribosomes
b.
mitochondria
d.
chloroplasts
'; answerText[19] = '
B
'; numberText[20] = '21.'; questionText[20] = '
Which of the ' + 'following cells would probably contain the greatest number of mitochondria
a.
stomach cells
c.
bone cells
b.
muscle cells
d.
red blood cells
'; answerText[20] = '
B
'; numberText[21] = '22.'; questionText[21] = '
Any cell component ' + 'that performs specific functions is called:
a.
an organelle
c.
a eukaryote
b.
a nucleus
d.
a microorganism
'; answerText[21] = '
A
'; numberText[22] = '23.'; questionText[22] = '
Hooke’s discovery of cells was made observing
a.
living algal cells.
c.
dead plant cells.
b.
living human blood cells.
d.
dead protist cells.
'; answerText[22] = '
C
'; numberText[23] = '24.'; questionText[23] = '
When the volume ' + 'of a cell increases, its surface area
a.
increases at the same rate.
c.
increases at a faster rate.
b.
remains the same.
d.
increases at a slower rate.
'; answerText[23] = '
D
'; numberText[24] = '25.'; questionText[24] = '
Cells that ' + 'have a high energy requirement generally have many
a.
nuclei
c.
mitochondria ' + '
b.
flagella
d.
microfillaments
'; answerText[24] = '
C
'; numberText[25] = '26.'; questionText[25] = '
Which organelles ' + 'are a pathway for transport of materials
a.
endoplasmic reticulum
c.
mitochondria
b.
ribosomes
d.
Golgi bodies
'; answerText[25] = '
A
'; numberText[26] = '27.'; questionText[26] = '
Which organelle ' + 'selectively destroys tissue to shape the bodies of animals during early
development?
a.
lysosome
c.
cell membrane
b.
mitochondria
d.
ribosome
'; answerText[26] = '
A
'; numberText[27] = '28.'; questionText[27] = '
The ends of ' + 'this structure pinch off to form lysosomes
a.
endoplasmic reticulum
c.
Golgi bodies
b.
mitochondria
d.
centrioles
'; answerText[27] = '
C
'; numberText[28] = '29.'; questionText[28] = '
A cell that ' + 'can change its shape would be well suited for
a.
receiving and transmitting nerve impulses.
b.
covering the body surface.
c.
moving to different tissues through narrow ' + 'openings.
d.
All of the ' + 'above
'; answerText[28] = '
C
'; numberText[29] = '30.'; questionText[29] = '
Which organelles ' + 'store cellular secretions?
a.
endoplasmic reticulum
c.
Golgi bodies
b.
ribosomes
d.
centrioles
'; answerText[29] = '
C
'; numberText[30] = '31.'; questionText[30] = '
Which of the ' + 'following is not a specialized activity found in cells of Volvox (green algae) ' + 'colonies?
a.
photosynthesis
c.
movement
b.
transmission of messages
d.
reproduction
'; answerText[30] = '
B
'; numberText[31] = '32.'; questionText[31] = '
Ribosomes are
a.
surrounded by a double membrane
c.
composed of proteins and RNA
b.
manufactured in the cytosol
d.
attached to the smooth endoplasmic reticulum
'; answerText[31] = '
C
'; numberText[32] = '33.'; questionText[32] = '
Lysosomes function in cells to
a.
recycle cell parts
c.
shape developing body parts
b.
destroy viruses and bacteria
d.
all of the above
'; answerText[32] = '
D
'; numberText[33] = '34.'; questionText[33] = '
An example ' + 'of a prokaryotic cell is a(n)
a.
animal cell.
c.
bacterium.
b.
tree cell.
d.
"animalcule."
'; answerText[33] = '
C
'; numberText[34] = '35.'; questionText[34] = '
Which of the ' + 'following associations between a type of animal tissue and its primary function is ' + 'incorrect?
a.
connective tissue—transport of substances around the ' + 'body
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Name:
Cells & Organelles
True/False
Indicate whether the sentence or statement is true or false.
1.
Organelles enable eukaryotic cells to specialize.
2.
Chromatin carries a cell’s genetic information.
3.
Nucleoli produce the RNA of ribosomes
4.
Cells within a tissue carry out a common function.
5.
The ribosome is the site of protein synthesis within a cell.
6.
A unicellular organism is at a disadvantage when compared to a multicellular organism because a unicellular organism is unable to perform all life functions that a multicellular organism can.
7.
Cell membranes are totally permeable.
8.
As a cell gets larger, its volume increases at a faster rate than its surface area.
9.
ATP is produced primarily in mitochondria.
10.
The only difference between a plant cell and an animal cell is that plant cells have chloroplasts.
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
11.
Which of the following is not a function both multicellular and unicellular organisms can perform?
a.
coordinate the activities of organs
c.
produce other cells
b.
synthesize new living material
d.
regulate water balance
12.
Structures that support and give shape to cells are
a.
Golgi bodies
c.
basal bodies
b.
microtubules
d.
chloroplasts
13.
Which of the following functions are performed by both multicellular and unicellular organisms?
a.
regulating water balance
c.
producing other cells
b.
reacting to changes in the environment
d.
all of these
14.
What structures are associated with cell division?
a.
mitochondria
c.
Golgi bodies
b.
chloroplasts
d.
centrioles
15.
A complex network of membranes lying between the nuclear membrane and the cell membrane is
the
a.
mitochondria
c.
cristae
b.
chromosomes
d.
endoplasmic reticulum
16.
A particularly active cell might contain large amounts of
a.
chromosomes.
c.
mitochondria.
b.
vacuoles.
d.
walls.
17.
The cell membrane
a.
allows all substances to pass into and out of the cell
c.
is composed mainly of a protein bilayer
b.
prevents all substances from passing into and out of the cell
d.
is composed mainly of a lipid bilayer
18.
Sometimes these organelles are attached to the endoplasmic reticulum to form rough ER
a.
chloroplasts
c.
mitochondria
b.
ribosomes
d.
centrioles
19.
One difference between prokaryotes and eukaryotes is that
a.
nucleic acids are found only in prokaryotes.
b.
mitochondria are found in larger quantities in eukaryotes.
c.
Golgi vesicles are found only in prokaryotes.
d.
prokaryotes have no nuclear membrane.
20.
Cigar-shaped bodies in the cytoplasm known as centers of ATP production are
a.
Golgi bodies
c.
ribosomes
b.
mitochondria
d.
chloroplasts
21.
Which of the following cells would probably contain the greatest number of mitochondria
a.
stomach cells
c.
bone cells
b.
muscle cells
d.
red blood cells
22.
Any cell component that performs specific functions is called:
a.
an organelle
c.
a eukaryote
b.
a nucleus
d.
a microorganism
23.
Hooke’s discovery of cells was made observing
a.
living algal cells.
c.
dead plant cells.
b.
living human blood cells.
d.
dead protist cells.
24.
When the volume of a cell increases, its surface area
a.
increases at the same rate.
c.
increases at a faster rate.
b.
remains the same.
d.
increases at a slower rate.
25.
Cells that have a high energy requirement generally have many
a.
nuclei
c.
mitochondria
b.
flagella
d.
microfillaments
26.
Which organelles are a pathway for transport of materials
a.
endoplasmic reticulum
c.
mitochondria
b.
ribosomes
d.
Golgi bodies
27.
Which organelle selectively destroys tissue to shape the bodies of animals during early
development?
a.
lysosome
c.
cell membrane
b.
mitochondria
d.
ribosome
28.
The ends of this structure pinch off to form lysosomes
a.
endoplasmic reticulum
c.
Golgi bodies
b.
mitochondria
d.
centrioles
29.
A cell that can change its shape would be well suited for
a.
receiving and transmitting nerve impulses.
b.
covering the body surface.
c.
moving to different tissues through narrow openings.
d.
All of the above
30.
Which organelles store cellular secretions?
a.
endoplasmic reticulum
c.
Golgi bodies
b.
ribosomes
d.
centrioles
31.
Which of the following is not a specialized activity found in cells of Volvox (green algae) colonies?
a.
photosynthesis
c.
movement
b.
transmission of messages
d.
reproduction
32.
Ribosomes are
a.
surrounded by a double membrane
c.
composed of proteins and RNA
b.
manufactured in the cytosol
d.
attached to the smooth endoplasmic reticulum
33.
Lysosomes function in cells to
a.
recycle cell parts
c.
shape developing body parts
b.
destroy viruses and bacteria
d.
all of the above
34.
An example of a prokaryotic cell is a(n)
a.
animal cell.
c.
bacterium.
b.
tree cell.
d.
“animalcule.”
35.
Which of the following associations between a type of animal tissue and its primary function is incorrect?
a.
connective tissue—transport of substances around the body
b.
epithelial tissue—protective surface coverings
c.
muscle tissue—contraction
d.
nervous tissue—receiving and transmitting messages
36.
Which of the following is not part of an animal cell?
a.
protoplasm
c.
cell wall
b.
nucleus
d.
cell membrane
37.
The organelles associated with photosynthesis are the
a.
mitochondria.
c.
Golgi apparatus.
b.
chloroplasts.
d.
vacuoles.
38.
The cell theory states that
a.
Unicellular organisms are exceptions to the rule
b.
cells come from other cells
c.
cell membranes have a fluid mosaic structure
d.
A and B
39.
One early piece of evidence supporting the cell theory was the observation that
a.
only plants are composed of cells
c.
cells come from other cells
b.
only animals are composed of cells
d.
animal cells come from plant cells
40.
The semifluid that fills most of the cell outside the nucleus is called: