Test questions Flashcards
(129 cards)
1
Q
T/F: Broken, chipped, or cracked glassware can be used as long as it doesn’t leak.
A
false
2
Q
T/F: You should only wear safety glasses when you are working with chemicals that might be harmful to your eyes.
A
false
3
Q
T/F: You should inform your teacher immediately if you spill or splash chemicals that might be harmful to your eyes.
A
true
4
Q
T/F: Long hair should be tied back when working near an open fire.
A
true
5
Q
T/F: It’s okay to leave heat sources on for short periods when not in use as long as you electrical turn them down on low.
A
false
6
Q
T/F: Touching heated glassware with moistened fingers is a good way to see if it’s cool enough to handle.
A
false
7
Q
T/F: Test tubes should be pointed away from you and others when being heated.
A
true
8
Q
T/F: When using electrical equipment you should inspect the cord and plug before inserting it into the outlet.
A
true
9
Q
T/F: If chemicals get into your eyes flush them out immediately with plenty of water and inform your teacher.
A
true
10
Q
T/F: Dispose of compounds and chemicals in the nearest trash can. After use, pour liquids down the sink drain.
A
false
11
Q
T/F: Hot glass looks the same as cold glass.
A
true
12
Q
T/F: All chemicals in the lab are to be considered dangerous.
A
true
13
Q
T/F: Return all unused chemicals to their original containers.
A
false
14
Q
T/F: Work areas should be kept clean and tidy.
A
true
15
Q
T/F: Pipets are to be used to measure small amounts of liquid and can be used by drawing the liquid into it using your mouth.
A
false
16
Q
T/F: Laboratory work can be started immediately upon entering the lab even if the instructor is not yet present.
A
false
17
Q
T/F: Never remove chemicals or other equipment from the lab.
A
true
18
Q
T/F: Read all procedures thoroughly before entering the lab.
A
true
19
Q
T/F: All unauthorized experiments are prohibited.
A
true
20
Q
T/F: You are allowed to enter the chemical prep/storage area any time you need an item.
A
false
21
Q
T/F: Lab aprons should be worn during all lab activities.
A
true
22
Q
T/F: It’s okay to pick up broken up glass with your bare hands as long as the glass is placed in the trash.
A
false
23
Q
Flammable liquids should never be dispensed or used near: A. an open door B. an open flame C. another student D. a sink
A
an open flame
24
Q
If a lab fire erupts, immediately: A. notify the teacher B. run for the fire extinguisher C. throw water on it D. open windows
A
notify the teacher
25
```
If you do not understand a direction or part of a lab procedure, you should:
A. figure it out as you do the lab
B. try several methods until one works
C. ask the instructor before proceeding
D. skip it and go on to the next part
```
ask the instructor before proceeding
26
If a lab experiment is not completed, you should:
A. discuss the issue with the instructor
B. sneak in after school and work alone
C. come in during lunch and finish while eating
D. make up some reults
discuss the issue with the instructor
27
```
You are heating a piece of glass and now want to pick it up. You should:
A. use a rag or paper towel
B. pick up the end that looks cooler
C. use tongs
D. pour cold water on it
```
use tongs
28
```
You have been injured in the lab. You should:
A. visit the school nurse after class
B. see a doctor after school
C. tell the science teacher at once
D. apply first aid yourself
```
tell the science teacher at once
29
When gathering glassware and equipment for an experiment you should:
A. read all directions carefully to know what equipment is needed
B. examine all glassware to check for chips or cracks
C. clean and glassware that appears dirty
D. all of the above
all of the above
30
```
Personal eyeglasses provide as much protection as:
A. a face shield
B. safety glasses
C. splashproof chemical goggles
D. none of the above
```
none of the above
31
```
In a lab, the following should not be worn:
A. loose clothing
B. dangling jewelry
C. sandals
D. all of these
```
all of these
32
```
The following footwear is best in the lab:
A. sandals
B. open-toed shoes
C. close-toed shoes
D. shoes appropriate for the weather
```
close-toed shoes
33
```
Horseplay or practical jokes in the lab are:
A. always against the rules
B. okay
C. not dangerous
D. okay if you are working alomne
```
always against the rules
34
```
If an acid is splashed on your skin, wash at once with:
A. soap
B. oil
C. weak base
D, plenty of water
```
plenty of water
35
When you finish working with chemicals, biological specimens, and other lab substances, always:
A. treat your hands with skin lotion
B. wash hands thoroughly with soap and water
C. wipe your hands on a towel
D. wipe your hands on your clothes
wash hands thoroughly with soap and water
36
Which of the following statements about genetics is true?
A. DNA is made up of six different kinds of nucleotides/letters.
B. Each DNA is a single strand of nucleotides/letters.
C. Genes are proteins that produce DNA.
D. Differences among organisms reflect different letter sequences in DNA.
Differences among organisms reflect different letter sequences in DNA.
37
Which of the following statements about evolution is true?
A. Organisms evolve structures in response to needs.
B. Individuals evolve within the span of their own lifetimes
C. Evolution is deliberate and purposeful.
D. Evolution can result in adaptions.
Evolution can result in adaptions.
38
```
You notice that over the past month, many students on campus have started wearing a new style of school sweatshirt. You think to yourself that perhaps the bookstore has recently started selling this new sweatshirt style. This is an example of:
A. a type of observation
B. an experimental question
C. a hypothesis
D. an experiment
```
a hypothesis
39
```
Which classification category below is the most general and all inclusive?
A. genus
B. phylum
C. domain
D. kingdom
```
domain
40
Members if the kingdom Anamalia:
A. can obtain their food by eating other organisms
B. make their own food through photosynthesis
C. are composed of cells that lack a cell membrane
D. can obtain their food either by absorption or by photosynthesis
can obtain their food by eating other organisms
41
Which of the following statements is not an example of evolution that has resulted from human activity?
A. Like certain other crops, domesticated strawberries are larger than wild strawberries,
B. Some insect species are now resistant to pesticides.
C. Many strains of bacteria are now resistant to some commonly used antibiotics.
D. Because of hunting, organisms such as bears and wolves are fewer in number.
Because of hunting, organisms such as bears and wolves are fewer in number.
42
Life is organized in a hierarchical fashion. Which of the following sequences correctly lists that hierarchy from least inclusive to most inclusive?
A. ecosystem, population, organ system, cell, community, molecule, organ, organism, organelle, tissue
B. molecule, cell, organism, organ system, tissue, population, organ, organelle, community, ecosystem
C. molecule, organelle, cell, tissue, organ, organ system, organism, population, community, ecosystem
D. cell, molecule, organ system, organ, organelle, population, tissue, organism, ecosystem, community
C. molecule, organelle, cell, tissue, organ, organ system, organism, population, community, ecosystem
43
Your instructor asks you to look into your microscope to see a prokaryotic cell. You will be looking for a cell that:
A. makes up most of the tissues of your body
B. has no nuclear membrane
C. has a nucleus
D. is much larger than most cells in your body
has no nuclear membrane
44
```
To be scientifically valid, a hypothesis must be:
A. testable and falsifiable
B. part of a theory
C. controlled
D. reasonable
```
testable and falsifiable
45
```
The tree in your backyard is home to two cardinals, a colony of ants, a wasp's nest, two squirrels, and millions of bacteria. Together, all of these organisms represent:
A. a species
B. an ecosystem
C. a community
D. a population
```
a community
46
During a discussion about ecosystems, a student says, "Plants eat sunlight, and animals eat other organisms." Which of the following responses to the student's comment is most accurate?
A. Plants eat sunlight, but they also eat other organisms such as decomposers.
B. Plants don't eat sunlight; they eat sugars that they get from the soil.
C. Plants don't eat sunlight; they use it to make sugars.
D. Plants eat sunlight, but animals also eat bacteria, which are not considered organisms.
Plants don't eat sunlight; they use it to make sugars
47
Which statement below is correct as far as how biologists view the word "adaption?"
a. The birds that had a larger, stronger beak were able to thrive on the larger seeds that were the only available food in the habitat.
b. In order to take the new position at work, Sally had to wake up earlier than usual to drive into the city.
A. Both a & b
B. Neither a nor b
C. Only a
D. Only b
Only a
48
```
A water sample from a hot thermal vent in the ocean contained a unicellular organism which lacked a nucleus. Which is its most likely classification?
A. Domain Archae
B. Domain Bacteria
C. Domain Monera
D. Domain Eukarya
```
Domain Archae
49
A scientist performs a controlled experiment. This means that
A. one experiment is performed, but the scientist controls the variables.
B. the experiment is repeated many times to ensure that the results are accurate.
C. two variables of the experiment are conducted, one differing from the other by only a single variable
D. the experiment proceeds at a slow pace to guarantee that the scientist can carefully observe all reactions and process all experimental data
two variables of the experiment are conducted, one differing from the other by only a single variable
50
A hypothesis is:
A. a proposed explanation for a set of observations
B. the same as a theory
C. an explanatory idea that is broad in scope and supported by a large body of evidence
D. a widely accepted idea about a phenomenon
a proposed explanation for a set of observations
51
In an ecosystem,energy
A. typically flows from consumers to producers to decomposers
B. comes ultimately from bacteria
C. typically flows from producers through a series of consumers
D. cycles along with chemical nutrients
typically flows from producers through a series of consumers
52
```
Which of the sequences is not a correct pathway of energy through an ecosystem?
A. insects ---> birds ---> bacteria
B. plants ---> insects --> birds
C. bacteria ---> plants ---> birds
D. plants ---> birds ---> bacteria
```
C. bacteria ---> plants ---> birds
53
An antibiotic kills 99.9% of a bacterial population. You would expect the next generation of bacteria:
A. to be more contagious than the prior generation
B. to die out due to the drastic decrease on population size
C. to be just as susceptible to that antibiotic as was the previous generation
D. to be more resistant to that antibiotic
to be more resistant to that antibiotic
54
```
Organisms that are prokaryotes are in the domains:
A. Bacteria and Archaea
B. Fungi and Bacteria
C. Plantae and Animalia
D. Eukarya and Archaea
```
Bacteria and Archaea
55
Which of the following statements is not consistent with Darwin's theory of natural selection?
A. Factors in the environment result in some organisms having better reproductive success than others.
B. Natural selection can lead to the appearance of new species.
C. Individuals in a population exhibit variations, some of which are passed from parents to offspring.
D. Individual organisms experience genetic change during their life spans to better fit their environment.
Individual organisms experience genetic change during their life spans to better fir their environment
56
Organisms belonging in the kingdom Plantae:
A. are unicellular and lack a nucleus
B. are multicellular and lack a nucleus
C. obtain food by decomposing the remains of dead organisms and absorbing the nutrients
D. are photosynthetic
are photosynthetic
57
```
Which part of below represents the point where characteristics of life are first exhibited?
A. cell
B. organ
C. tissue
D. organism
```
cell
58
The teeth of grain-eating animals (such as horses) are usually broad and ridged. This makes the teeth suitable for grinding and chewing. Meat-eating animals (such as lions) have pointed teeth that are good for puncturing and ripping flesh. This illustrates:
A. the connection between firm and function only
B. a result of natural selection only
C. a food web
D. a result of natural selection as well as the connection between form and function
a result of natural selection as well as the connection between form and function
59
The role of a control in an experiment is to:
A. prove that a hypothesis is correct
B. ensure repeatability
C. counteract the negative effect of the experiment
D. provide a basis of comparison to the experimental group
provide a basis of comparison to the experimental group
60
Which of the following statements about the domain Bacteria is true?
A. All bacteria lack a nucleus.
B. All bacteria are multicellular items.
C. Archaea belong to this domain.
D. All bacteria have a membrane-bound nucleus.
All bacteria lack a nucleus.
61
```
Which of the following is a kingdom within the domain Eukarya?
A. Fungi
B. Bacteria
C. Archaea
D. Viruses
```
Fungi
62
Which of the following statements provides the best evidence that there is a common genetic code that demonstrates the unity of life?
A. Bacteria, mushrooms, and cats all have DNA
B. Through genetic engineering, a gene from a firefly can be inserted into bacterium to make it glow.
C. Many insects can pollinate only a particular species of plant due to many generations of evolutionary adaption.
D. Bees, birds, and bats all have wings and fly.
Through genetic engineering, a gene from a firefly can be inserted into bacterium to make it glow.
63
T/F: The word "data" refers to the independent variable in an experiment.
false
64
Purely, freshly-distilled water has a pH of 7. This means that:
A. the concentration of H+ ions in the water is 7 times the concentration of OH- ions in the water.
B. there are no H+ ions in the water.
C. there are no OH- ions in the water.
D. the concentration of H+ ions in the water equals the concentration of OH- ions in the water.
E. the concentration of OH- ions in the water is 7 times the concentration of H+ ions in the water.
the concentration of H+ ions in the water equals the concentration of OH- ions in the water
65
```
Which of the following trace elements is commonly added to table salt to prevent the formation of goiters?
A. iron
B. fluoride
C. calcium
D. iodine
E. magnesium
```
iodine
66
```
Which of the following solutions has the greatest concentration of hydrogen ions?
A. household bleach at pH 12
B. gastric juice at pH 2
C. tomato juice at pH 4
D. black coffee at pH 5
E. vinegar at pH 3
```
gastric juice at pH 2
67
Atoms where outer electrons contain eight electrons tend to:
A. form ionic bonds in aqueous solutions
B. from covalent bonds in aqueous solutions
C. be unstable and chemically very reactive
D. be isotopes and very radioactive
E. be stable and chemically nonreactive, or inert
be stable and chemically nonreactive, or inert
68
```
What is the atomic mass of an atom that has 6 proteins, 6 neutrons, and 6 electrons?
A. 12
B. 6
C. 18
D. 8
E. +1
```
12
69
```
The tendency of water molecules to stick together is referred to as:
A. adhesion
B. evaporation
C. transpiration
D. polarity
E. cohesion
```
cohesion
70
Nitrogen (N) is much more electronegative than hydrogen (H). Which of the following statements is correct about the atoms in ammonia (NH3)?
A. Each hydrogen atom has a slight negative charge.
B. There are covalent bonds between the hydrogen atoms.
C. The nitrogen atom has a strong positive charge.
D. The nitrogen atom has a partial positive charge.
E. Each hydrogen atom has a partial positive charge.
Each hydrogen atom has a partial positive charge.
71
What is the fundamental difference between covalent and ionic bonding?
A. In covalent bonding, both partners end up with filled outer electron shells; in ionic bonding, one partner does and the other does not.
B. Covalent bonds form between atoms of the same element; ionic bonds form between atoms of different elements.
C. In a covalent bond, the partners share a pair of electrons; in an ionic bond, one partner accepts electrons from the other.
D. In a covalent bond, the partners have identical electronegativity; in an ionic bond, one of them is more electronegative
E. Covalent bonding involves only the outermost electron shell; ionic bonding also involves the next electron shell inside the outermost shell.
C. In a covalent bond, the partners share a pair of electrons; in an ionic bond, one partner accepts electrons from the other.
72
```
When two atoms are equally electronegative, they will interact to form:
A. ions
B. equal numbers of isotopes
C. polar covalent bonds
D. nonpolar covalent bonds
E. ionic bonds
```
nonpolar covalent bonds
73
Which of the following statements is true about buffer solutions?
A. They are found only in living systems and biological fluids
B. They maintain a constant pH when acids are added to them but not when bases are added to them.
C. They maintain a constant pH of exactly 7 in all living cells and biological fluids.
D. They maintain a relatively constant pH when either acids or bases are added to them.
E. They maintain a constant pH when bases are added to them but not when acids are added to them.
D. They maintain a relatively constant pH when either acids or bases are added to them.
74
A buffer:
A. donates H+ ions when conditions become too basic and accepts H+ ions when conditions become too acidic
B. is a base that is used to offset overly acidic conditions in the body
C. donates OH- ions when conditions become too basic and accepts OH- ions when conditions become too acidic
D. is an acid that is used to offset overly basic conditions in the body
E. donates OH- ions when conditions become too acidic and accepts OH- ions when conditions become too basic
A. donates H+ ions when conditions become too basic and accepts H+ ions when conditions become too acidic
75
Water molecules stick to other water molecules because:
A. hydrogen bonds form between the hydrogen atoms of one water molecule and the oxygen atoms of other water molecules
B. covalent bonds form between the hydrogen atoms of one water molecule and the oxygen atoms of other water molecules
C. the hydrogen atoms of adjacent water molecules are attracted to one another
D. the oxygen atoms of adjacent water molecules are attracted to one another
E. water molecules are neutral, and neutral molecules are attracted to one another
A. hydrogen bonds form between the hydrogen atoms of one water molecule and the oxygen atoms of other water molecules
76
Hydrophobic substances such as vegetable oil are:
A. polar substances that repel water molecules
B. polar substances that have an affinity for water
C. charged molecules that hydrogen-bond with water molecules
D. nonpolar substances that repel water molecules
E. nonpolar substances that have an attraction for water molecules
D. nonpolar substances that repel water molecules
77
```
The four most common elements in living organisms are:
A. C, H, O, Na
B. C, H, O, N
C. C, N, O, Na
D. Fe, N, O, Ca
E. C, H, O, Fe
```
C, H, O, N
78
```
A solution with a pH of 7 is:
A. neutral
B. strongly acidic
C. strongly basic
D. weakly acidic
E. weakly basic
```
neutral
79
```
Which of the following solutions has the greatest concentration of hydroxyl ions [OH-]?
A. vinegar at pH 3
B. lemon juice at pH 2
C. tomato juice at pH 4
D. urine at pH 6
E. seawater at pH 8
```
seawater at pH 8
80
```
If you found a fossilized dinosaur bone, what method could be used to determine the age of the fossil?
A. high-pressure liquid chromatograpy
B. isotope analysis
C. DNA fingerprinting
D. radial immunodiffusion
E. electrophoresis
```
isotope analysis
81
```
Which type of bond must be broken for water to vaporize?
A. ionic bonds
B. polar covalent bonds
C. nonpolar covalent bonds
D. hydrogen bonds
```
hydrogen bonds
82
```
Water's surface tension and heat storage capacity is accounted for by its:
A. size
B. weight
C. mass
D. orbitals
E. hydrogen bonds
```
weight
83
```
An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. How many electrons does boron have?
A. 15
B. 5
C. 11
D. 2
E. 0
```
5
84
```
Different atomic forms of an element contain the same number of protons but a different number of neutrons. What are these different atomic forms called?
A. isotopes
B. isomers
C. radioactive atoms
D. ions
E. neutronic atoms
```
istopes
85
One of the buffers that contribute to pH stability in human blood is carbonic acid (H2CO3). Carbonic acid is a week acid that dissociates into a bicarbonate ion (HCO3-) and a hydrogen ion (H+). Thus,
H2CO3 HCO3- + H+
If the pH of the blood drops, one would expect:
A. the HCO3- to act as an acid and remove excess H+ with the formation of H2CO3
B. a decrease in the concentration of H2CO3 and an increase in the concentration of HCO3-
C. the HCO3- to act as a base and remove excess H+ with the formation of H2CO3
D. the concentration of bicarbonate ion (HCO3-) to increase
E. the concentration of hydroxide ion (OH-) to increase
C. the HCO3- to act as a base and remove excess H+ with the formation of H2CO3
86
```
The sodium atom contains 11 electrons, 11 protons, and 12 neutrons. What is the mass number of sodium?
A. 0
B. 34
C. 22
D. 23
E. 11
```
23
87
Which of the following statements regarding the oxygen atom of a water molecule is true?
A. Oxygen is electrically neutral.
B. Oxygen is attracted to the negatively charged atoms of other molecules.
C. Oxygen is more positively charged than the hydrogen atoms.
D. Oxygen is more electronegative than the hydrogen atoms.
E. Oxygen attracts electrons less strongly than the hydrogen atoms.
Oxygen is more electronegative than the hydrogen atoms.
88
```
***PICTURE***
Based on your knowledge of the polarity of water molecules, the solute molecule is most likely:
A. positively charged
B. hydrophobic
C. negatively charged
D. nonpolar
E. without charge
```
positively charged
89
A diabetic, who does not utilize insulin properly, will metabolize fats instead of glucose. A condition called diabetic ketoacidosis is a common result of excessive fat metabolism, causing blood pH values of 7.1 or less (normal range = 7.35 - 7.45)/ What has happened to the blood pH and why?
A. The pH is above normal (basic) because the glucose is polar.
B. The pH is below normal because buffers can donate OH+.
C. The pH is below normal (acidic) because the buffering capacity was exceeded.
D. The pH is above normal (basic) because the ketones are too basic.
E. The pH is not affected because the blood buffers can absorb the excess H+.
The pH is below normal (acidic) because the buffering capacity was exceeded.
90
Carbon dioxide (CO2) is readily soluble in water, according to the equation CO2 + H2O ---> H2CO3. Carbonic acid (H2CO3) is a weak acid. If CO2 is bubbled into a beaker containing pure, freshly-distilled water, which of the following graphs correctly describes the results?
A. wave graph
B. gradually goes down
C. straight line at 7
D. gradually goes up
E. goes down, then straight, then up, then straight, then down
gradually goes up
91
```
Which of the following particles is found in the nucleus of an atom?
A. protons and electrons
B. only electrons
C. only protons
D. only neutrons
E. protons and neutrons
```
protons and neutrons
92
The ionic bond of sodium chloride is formed when:
A. sodium and chlorine share an electron
B. chlorine gains an electron from sodium
C. chlorine gains a proton from sodium
D. sodium gains an electron from chlorine.
E. sodium and chlorine both lose electrons from their outer valence electrons
chlorine gains an electron from sodium
93
```
In a water molecule, hydrogen and oxygen are held together by a ____ bond.
A. double covalent
B. ionic
C. hydrogen
D. polar covalent
E. nonpolar covalent
```
polar covalent
94
Which of the following statements best describes a compound?
A. A compound is a solution.
B. A compound is exemplified by sodium.
C. A compound is a pure element.
D. A compound is less common than a pure element.
E. A compound contains two or more different elements in a fixed ratio.
A compound contains two or more different elements in a fixed ratio.
95
Which of the following statements about pH is true?
A. Basic pH levels are less than 7.
B. The pH scale is a measure of oxygen ion concentration.
C. The pH scale of solutions inside most cells is close to 9.0.
D. A single unit change on the pH scale is equivalent to a 1% change in hydrogen ion concentration.
E. An increase in hydrogen ion concentration means a decrease in pH scale units.
An increase in hydrogen ion concentration means a decrease in pH scale units.
96
Which of the following best describes the atomic number of an atom?
A. the number of electrons in the atom
B. the number of neutrons in the atom
C. the number of proton, electrons, and neutrons in the atom
D. the number of protons in the atom
E. the net electrical charge of the atom
the number of protons in the atom
97
The temperature of evaporation is much higher for water than for alcohol, which of the following is the most logical chemical evaporation for this phenomenon?
A. Fewer hydrogen bonds form between alcohol molecules. As a result, less heat is needed for alcohol molecules to break away from solution and enter the air.
B. Ionic bonds form between alcohol molecules. These are the weakest type of bond and are easier to break than the hydrogen bonds between water molecules.
C. Water is a better solvent than alcohol. Therefore, alcohol can break covalent bonds easily and will not be restricted from evaporating from its solute.
D. Alcohol has a higher surface tension than water. This means that alcohol molecules can easily break away from other alcohol molecules and evaporate at a lower temperature.
E, Alcohol molecules are more cohesive than water molecules. This means that as alcohol molecules evaporate, they pull other alcohol molecules into the air along with them.
A. Fewer hydrogen bonds form between alcohol molecules. As a result, less heat is needed for alcohol molecules to break away from solution and enter the air.
98
One of the buffers that contribute to pH stability in human blood is carbonic acid (H2CO3). Carbonic acid is a weak acid that when placed in an aqueous solution dissociates into a bicarbonate ion (HCO3-) and a hydrogen ion (H+). Thus,
H2CO3 ↔ HCO3- + H+
If the pH of the blood drops, one would expect
A. a decrease in the concentration of HCO3- and an increase in the concentration of H2O
B. an increase in the concentration of H2CO3 and a decrease in the concentration of H2O
C. a decrease in the concentration of H2CO3 and an increase in the concentration of H2O
D a decrease in the concentration of HCO3- and an increase in the concentration of both H2CO3 and H2O
E. an increase in the concentration of HCO3- and a decrease in the concentration of H2O
C. a decrease in the concentration of H2CO3 and an increase in the concentration of H2O
99
```
A(n) _____ forms when two atoms share electrons.
A. element
B. ion
C. covalent bond
D. hydrogen bond
E. ionic bond
```
covalent bond
100
```
If natural atoms become positive ions, they:
A. lose electrons
B. gain electrons
C. gain protons
D. lose protons
```
lose electrons
101
T/F: To discociate means to dissolve or break apart.
true
102
T/F: The difference between a strong acid and a weak acid is the amount of the acid added to the water originally.
false
103
T/F: Water is more dense in a solid state than it is in a liquid state.
false
104
```
If you place the corner of a paper towel into a droplet of water the water moves across the paper towel. Which of the following would explain the movement of water
A. surface tension
B. cohesion
C. adhesion
D. both cohesion and adhesion
```
both cohesion and adhesion
105
Which statement is not true about ionic bonds?
A. One atom acts as an electron donor and another atom acts as an electron acceptor.
B. Electrons are completely lost or gained in ion formation.
C. An ion has the same number of electrons as a nonionic atom of the same element.
D. An ionic bond occurs between positive ions and negative ions.
E. A salt such as NaCl is formed by an ionic reaction.
An ion has the same number of electrons as a nonionic atom of the same element
106
As a solid, water floats. This means that:
A. solid water is less dense than liquid water
B. organisms is ponds, lakes, and reservoirs can survive under the ice cover
C. this is due to hydrogen bonding changes
D. all of the choices are correct
all of the choices are correct
107
Which statement below is not true concerning phase change in matter from a solid to a liquid?
A. attractive forces must be overcome
B. energy of the molecules must increase
C. molecules take on the shape of the container
D. molecules are drawn closer together
molecules are drawn closer together
108
The primary structure of a protein is:
A. maintained by hydrogen bonds
B. an "a" helix or a pleated sheet
C. composed of irregular folds
D. the amino acid sequence of the polypeptide chain
E. composed of two or more polypeptide chains
the amino acid sequences of the polypeptide chain
109
If you were to add olive oil to your food as part of a diet to lower your risk of atherosclerotic disease, you would use olive oil that:
A. is modified to be solid at room temperature
B. contains high levels of trans fats
C. is hydrogenated
D. is liquid at room temperature
E. has lard in it
is liquid at room temperature
110
```
Which of the following is a carboxyl group?
A. -COOH
B. -C=O
C. -NH2
D. -OH
E. -SH
```
-COOH
111
Cellulose differs from starch in that:
A. most animals cannot break down cellulose, whereas starch is easily digested
B. the monomers of cellulose are held together by covalent bonds, whereas the monomers of starch are held together by hydrogen bonds
C. glycogen is formed by plants and cellulose by animals
D. cellulose is highly branched, whereas starch is unbranched
E. starch is made of glucose monomers, whereas cellulose is made of fructose monomers
most animals cannot break down cellulose, whereas starch is easily digested
112
```
The molecular formula for glucose is C6H12O6. What would be the molecular formula for a molecule made by linking three glucose molecules together by dehydration reactions?
A. C18H32O16
B. C18H36O18
C. C6H10O5
D. C3H6O3
E. C18H10O15
```
C18H32O16
113
```
The function of each protein is a consequence of its specific shape. What is the term used for a change in a protein's three-dimensional shape or conformation due to disruption of hydrogen bonds, disulfide brides, or ionic bonds?
A. destabilization
B. renaturation
C. stabilization
D. denaturation
E. hydrolysis
```
denaturation
114
```
Peptide bonds
A. Are used to form amino acids
B. link amino acids
C. are formed by a hydrolysis reaction
D. form between fatty acids
E. blind monosaccharides
```
Link amino acids
115
```
A major type of lipid found in cell membranes is
A. Triglycerides
B. Phospholipids
C. Waxes
D. Glycerol
E. Cellulose
```
Phospholipids
116
A phospholipid is composed of:
A. One fatty acid molecule linked to one glycerol molecule and two phosphate groups
B. One glycerol molecule linked to one phosphate group and two fatty acids
C. One glycerol molecule linked to three fatty acids
D. One fatty acid lumped to three glycerol molecules
E. One glycerol molecule liked to three phosphate groups
On glycerol molecule linked to one phosphate group and to fatty acids
117
What would be an unexpected consequence of changing one amino acid in a protein consisting of 325 amino acids?
A. The biological activity or function of the protein might be altered
B. The tertiary structure of the protein might be changed
C. The primary structure of the protein would be changed
D. Only A and C are correct
E. A, B, and C are correct
A, B, and C are correct
118
```
Foods that are high in fiber are most likely derived from
A. Dairy products
B. Plants
C. Fish
D. Red meats
E. Poultry
```
Plants
119
Which of the following characteristics of protein will remain intact if the protein is denatured?
A. The function of the protein
B. The binding properties of the protein
C. The number of amino acids in the protein
D. The solubility of the protein in water
E. The shape of the protein
The number of amino acids in the protein
120
```
When of the following is an example of secondary structure in a protein?
A. The joint of two polypeptide chains
B. A fibrous shape
C. An alpha helix
D. A particular amino acid sequence
E. A globular shape
```
An alpha helix
121
```
The tertiary structure of s polypeptide refers to
A. Its size
B. The number of R groups it contains
C. Triglycerides
D. Saturated
E. Unsaturated
```
Unsaturated
122
```
The storage form of carbohydrates is ___ in animals and ___ in plants.
A. Cellulose...glycogen
B. Glycogen...cellulose
C. Glycogen...starch
D. Starch...glycogen
E. Chitin...glycogen
```
Glycogen...starch
123
```
Which of the following substances is a lipid?
A. DNA
B. Steroids
C. Cellulose
D. Enzymes
E. Glucose
```
Steroids
124
```
A carbon atom is most likely to form what kind of bond with other atoms?
A. Ionic
B. Covalent
C. Hydrogen
D. A and B only
E. A, B, and C
```
Covalent
125
A scientist suspects that the food in an ecosystem, may have been contaminated with radioactive nitrogen over a period of months. Which of the following substances could be examined for radioactivity to test the hypothesis?
A. The sugars produce during photosynthesis by plants growing in the ecosystem
B. He cholesterol in the cell membrane of organisms living in the ecosystem
C. The hair produced by humans living in the ecosystem
D. The cell walls of plants growing in the ecosystem
E. The adipose tissue from the animals living in the ecosystem
The hair produced by humans living in the ecosystem
126
Which of your following is true of cellulose?
A. It is a storage polysaccharide for energy in animal cells
B. It is a major structural component of plant cell walls
C. It is a major structural component of animal cell plasma membranes.
D. It is a storage polysaccharide for energy in plant cells
E. It is a polymer composed of sucrose monomers
It is a mops jot structural component of plant cells walls
127
```
Many names for sugars end in the suffix
A. -ase
B. -hyde
C. -ose
D. -acid
E. -ing
```
-ose
128
T/F: Of the two types of cholesterol, the one known as HDL is the one considered to be a bigger health problem.
false
129
T/F: Humans use cholesterol in the making of carbohydrates.
false
