Category: 1st Semester

PCC Biochemistry 2011

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PCC Biochemistry 2011
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 1.
The three particles that make up atoms are
a.
 protons, neutrons, and isotopes.
c.
 positives, negatives, and electrons.
b.
 neutrons, isotopes, and electrons.
d.
 protons, neutrons, and electrons.
 2.
The space surrounding the nucleus of an atom contains
a.
 protons.
c.
 neutrons.
b.
 electrons.
d.
 ions.
 3.
Democritus believed that atoms
a.
 were composed of electrons.
c.
 could be divided.
b.
 were composed of protons.
d.
 could not be divided.
 4.
If an atom contains 3 protons, 4 neutrons,  and 3 electrons, its mass number would be
a.
 3.
c.
 7.
b.
 4.
d.
 11.
 5.
If a chlorine atom had 17 protons and 18 neutrons, it would be called
a.
 chlorine-17.
c.
 chlorine-35.
b.
 chlorine-18.
d.
 chlorine-1.
 6.
Isotopes are atoms of the same element with the same number of protons and
a.
 a different number of electrons.
c.
 a different number of neutrons.
b.
 a different number of molecules.
d.
 the same number of neutrons.
 7.
Which of the following is a use of radioactive isotopes?
a.
 can determine the ages of rocks and fossils
b.
 can be used to treat cancer and kill bacteria that cause food to spoil
c.
 can be used as “tracers” to follow the movements of substances within organisms
d.
 all of the above
 8.
If an atom contains 11 protons and 12 neutrons, its atomic number is
a.
 1.
c.
 12.
b.
 11.
d.
 23.
 9.
Which of the following terms describes a substance formed by the combination of two or more elements in definite proportions?
a.
 compound
c.
 nucleus
b.
 isotope
d.
 enzyme
 10.
Which of the following makes up a molecule of water?
a.
 one atom of hydrogen and one atom of oxygen
b.
 one atom of sodium and one atom of chlorine
c.
 one atom of hydrogen and two atoms of oxygen
d.
 two atoms of hydrogen and one atom of oxygen
 11.
Which of the following is NOT true about chlorine?
a.
 It is a poisonous, greenish gas.
b.
 It combines with sodium to form table salt.
c.
 It was used to kill many soldiers in World War I.
d.
 It is not reactive.
 12.
Which of the following statements about a compound is true?
a.
 The physical and chemical properties of a compound are usually very different from those of the elements from which it is formed.
b.
 Only the physical properties of a compound are usually the same as those of the elements from which it is formed.
c.
 Only the chemical properties of a compound are usually the same as those of the elements from which it is formed.
d.
 The physical and chemical properties of a compound are usually the same as those of the elements from which it is formed.
 13.
A covalent bond is formed as the result of
a.
 transferring electrons.
c.
 transferring protons.
b.
 sharing an electron pair.
d.
 sharing a proton pair.
 14.
Which term does NOT apply to sodium chloride?
a.
 molecule
c.
 compound
b.
 ionic bonding
d.
 crystal
 15.
What type of electron is available to form bonds?
a.
 valence
c.
 ionic
b.
 nucleus
d.
 covalent
 16.
What type of ion forms when an atom loses electrons?
a.
 neutral
c.
 negative
b.
 positive
d.
 possibly positive or negative
 17.
Ice floats on water because
a.
 of cohesion.
c.
 water shrinks when it freezes.
b.
 ice has a higher density than water.
d.
 water expands when it freezes.
 18.
The most abundant compound in most living things is
a.
 carbon dioxide.
c.
 sodium chloride.
b.
 water.
d.
 sugar.
 19.
Water molecules are polar, with the
a.
 oxygen side being slightly positive and the hydrogen side being slightly negative.
b.
 oxygen and hydrogen sides being slightly positive.
c.
 oxygen and hydrogen sides being slightly negative.
d.
 oxygen side being slightly negative and the hydrogen side being slightly positive.
 20.
In a water molecule, shared electrons spend more time around the oxygen atom than the hydrogen atoms.  As a result, the oxygen atom is
a.
 slightly negative.
c.
 slightly positive.
b.
 very negative.
d.
 very positive.
 21.
A solution is a(an)
a.
 combination of isotopes.
b.
 chemical reaction.
c.
 evenly distributed mixture of two or more substances.
d.
 combination of two or more liquids.
 22.
If you stir salt into boiling water, you produce a
a.
 mixture called a suspension.
c.
 solution and suspension.
b.
 mixture called a solution.
d.
 mixture only.
 23.
When salt is dissolved in water, water is the
a.
 reactant.
c.
 solute.
b.
 solution.
d.
 solvent.
 24.
While preparing a cell culture, a scientist places a colony of bacteria into distilled water and stirs it up.  This mixture of water and living cells would best be called a(an)
a.
 solution.
b.
 suspension.
c.
 buffer.
d.
 adhesion.
 25.
If the pH of stomach acid and of oven cleaner were measured,
a.
 both would be below 7.
b.
 both would be above 7.
c.
 the pH of stomach acid would be above 7, but the pH of oven cleaner would be below 7.
d.
 the pH of stomach acid would be below 7, but the pH of oven cleaner would be above 7.
 26.
A map of eastern North America, showing the pH of rainfall in the various states, indicates that the pH of rain in New York State varies from 4.22 to 4.40. According to these figures, the most acidic rainfall in New York State has a pH of
a.
 4.22.
c.
 4.35.
b.
 4.30.
d.
 4.40.
 27.
A substance with a pH of 6 is called
a.
 an acid.
c.
 both an acid and a base.
b.
 a base.
d.
 neither an acid nor a base.
 28.
Solutions that contain concentrations of H+ ions lower than pure water
a.
 have pH values below 7.
c.
 are bases.
b.
 are acids.
d.
 are enzymes.
 29.
Amino acid is to protein as
a.
 fat is to lipid.
c.
 sugar is to fat.
b.
 DNA is to RNA.
d.
 simple sugar is to starch.
 30.
A monosaccharide is a
a.
 carbohydrate.
c.
 nucleic acid.
b.
 lipid.
d.
 protein.
 31.
Which of the following is NOT a monomer?
a.
 a glucose molecule
c.
 a nucleotide
b.
 an amino acid
d.
 a protein
 32.
Which of the following is NOT a function of proteins?
a.
 store and transmit genetic information
b.
 help to fight disease
c.
 control the rate of reactions and regulate cell processes
d.
 build tissues such as bone and muscle
 33.
Which statement is true?
a.
 Simple sugars are made of polysaccharides.
b.
 Glycerol is made of fatty acids.
c.
 RNA molecules are made of nucleotides.
d.
 Amino acids are made of proteins.
 34.
In chemical reactions, atoms are
a.
 created.
c.
 rearranged.
b.
 destroyed.
d.
 neutralized.
 35.
When hydrogen and oxygen combine to form water, water is
a.
 a product.
c.
 both a product and a reactant.
b.
 a reactant.
d.
 neither a product nor a reactant.
 36.
Identify the reactant(s) in the chemical reaction, CO2 + H2O ® H2CO3.
a.
 CO2, H2O, and H2CO3
c.
 H2CO3
b.
 CO2 and H2O
d.
 CO2
 37.
What is the process that changes one set of chemicals into another set of chemicals?
a.
 cohesion
c.
 chemical reaction
b.
 adhesion
d.
 dissolving
 38.
What is the term used to describe the energy needed to get a reaction started?
a.
 adhesion energy
c.
 cohesion energy
b.
 activation energy
d.
 chemical energy
 39.
Chemical reactions that release energy
a.
 will not occur.
c.
 will always explode.
b.
 will never explode.
d.
 often occur spontaneously.
 40.
If a reaction in one direction releases energy, the reaction in the opposite direction
a.
 also releases energy.
c.
 destroys energy.
b.
 absorbs energy.
d.
 cannot occur.
 41.
Which of the following is a form of energy that may be released during a chemical reaction?
a.
 heat
c.
 light
b.
 sound
d.
 all of the above
 42.
Which of the following statements about enzymes is NOT true?
a.
 Enzymes work best at a specified pH.
b.
 All enzymes have the same shape as their substrates.
c.
 Enzymes are proteins.
d.
 The shape of an enzyme allows it to do its job.
 43.
Which of the following statements is true about catalysts?
a.
 Catalysts slow down the rate of chemical reactions.
b.
 All catalysts are enzymes.
c.
 Catalysts are used up during a chemical reaction.
d.
 Catalysts lower the activation energy of a chemical reaction.
 44.
A substance that accelerates the rate of a chemical reaction is called a(an)
a.
 catalyst.
c.
 molecule.
b.
 lipid.
d.
 element.
 45.
Enzymes affect the reactions in living cells by changing the
a.
 products of the reaction.
c.
 temperature of the reaction.
b.
 speed of the reaction.
d.
 pH of the reaction.
 

Short Answer
 46.
Why are atoms considered neutral?
 47.
What is a molecule?
 

Other

USING SCIENCE SKILLS

 

pH Values of Some Common Substances
Substance pH
Hydrochloric acid
1.0
Sulfuric acid
1.2
Tomatoes
4.2
Rainwater
6.2
Pure water
7.0
Sea water
8.5
Ammonium chloride
11.1
Sodium hydroxide
13.0

Figure 2–2
 48.
Applying Concepts What is the strongest acid listed in Figure 2–2?
 49.
Applying Concepts What is the pH of the strongest base listed in Figure 2–2?
 50.
Applying Concepts Using your knowledge of the pH scale, which of the chemicals in Figure 2-2 has the lowest concentration of H+ ions?

 
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Nucleic Acids

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Modified True/False
Indicate whether the statement is true or false.  If false, change the identified word or phrase to make the statement true.
 1.
It has been discovered that the genetic material is protein. _________________________
 2.
Hershey and Chase were the first two scientists to prove that genetic material is composed of proteins. _________________________
 3.
The five-carbon sugar in DNA nucleotides is called ribose. _________________________
 4.
After years of research, the structure of the DNA molecule is now known to be a double helix. _________________________
 5.
Franklin’s X-ray diffraction images suggested that the DNA molecule resembled a tightly coiled spring, a shape called a helix. _________________________
 6.
In all living things, DNA replication must occur after cell division. _________________________
 7.
Before a DNA molecule can replicate itself, it must coil up. _________________________
 8.
Helicases unwind the double helix of DNA by breaking the nitrogen bonds that link the base pairs. _________________________
 9.
Errors in nucleotide sequence that occur during replication cannot be corrected. _________________________
 10.
RNA molecules contain the five-carbon sugar ribose. _________________________
 11.
During transcription, the information on a DNA molecule is “rewritten” into an mRNA molecule. _________________________
 12.
When a tRNA anticodon binds to an mRNA codon, the amino acid detaches from the tRNA molecule and bonds to the end of a growing protein chain. _________________________
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 13.
Griffith’s transformation experiments
a.
 changed proteins into DNA.
b.
 caused harmless bacteria to become deadly.
c.
 resulted in DNA molecules becoming proteins.
d.
 were designed to show the effect of heat on bacteria.
 14.
Griffith’s experiments showed that
a.
 dead bacteria could be brought back to life.
b.
 harmful bacteria were hardier than harmless bacteria.
c.
 heat caused the harmful and harmless varieties of bacteria to fuse.
d.
 genetic material could be transferred between dead bacteria and living bacteria.
 15.
Avery’s experiments showed that transformation
a.
 is prevented by protein-destroying enzymes.
b.
 is prevented by DNA-destroying enzymes.
c.
 causes protein to become DNA.
d.
 is caused by a protein.
 16.
Avery and his research team concluded that
a.
 RNA was the genetic material.
b.
 protein bases were the genetic material.
c.
 DNA and RNA were found in the human nucleus.
d.
 DNA was responsible for transformation.
 17.
Using radioactive tracers to determine the interactions of bacteriophages and their host bacteria, Hershey and Chase demonstrated without question that
a.
 genes are composed of protein molecules.
b.
 DNA and proteins are actually the same molecules located in different parts of cells.
c.
 bacteria inject their DNA into the cytoplasm of bacteriophages.
d.
 DNA is the molecule that stores genetic information in cells.
 18.
All of the following are true of the viruses Hershey and Chase used in their study except
a.
 they consisted of DNA surrounded by a protein coat.
b.
 they injected their DNA into cells.
c.
 they destroyed the DNA of the infected bacteria.
d.
 they caused infected bacteria to make many new viruses.
 19.
The scientist who worked with Martha Chase to prove that genetic material is composed of DNA was
a.
 Alfred Hershey.
c.
 Francis Crick.
b.
 Oswald Avery.
d.
 Rosalind Franklin.
 20.
Molecules of DNA are composed of long chains of
a.
 amino acids.
c.
 monosaccharides.
b.
 fatty acids.
d.
 nucleotides.
 21.
Which of the following is not part of a molecule of DNA?
a.
 deoxyribose
c.
 phosphate
b.
 nitrogen base
d.
 ribose
 22.
A nucleotide consists of
a.
 a sugar, a protein, and adenine.
b.
 a sugar, an amino acid, and starch.
c.
 a sugar, a phosphate group, and a nitrogen base.
d.
 a starch, a phosphate group, and a nitrogen base.
 23.
The part of the molecule for which DNA is named is the
a.
 phosphate group.
c.
 nitrogen base.
b.
 sugar.
d.
 hydrogen bonds.
 24.
Purines and pyrimidines are
a.
 nitrogen bases found in amino acids.
b.
 able to replace phosphate groups from defective DNA.
c.
 names of specific types of DNA molecules.
d.
 classification groups of nitrogen bases.
 25.
Of the four nitrogen bases in DNA, which two are purines and which two are pyrimidines?
a.
 purines: adenine, thymine; pyrimidines: uracil, cytosine
b.
 purines: adenine, thymine; pyrimidines: guanine, cytosine
c.
 purines: adenine, guanine; pyrimidines: thymine, cytosine
d.
 purines: uracil, thymine; pyrimidines: guanine, cytosine
 26.
The amount of guanine in an organism always equals the amount of
a.
 protein.
c.
 adenine.
b.
 thymine.
d.
 cytosine.
 27.
adenine : thymine ::
a.
 protein : DNA
c.
 guanine : cytosine
b.
 Watson : Crick
d.
 guanine : thymine
 28.
Watson and Crick built models that demonstrated that
a.
 DNA and RNA have the same structure.
b.
 DNA is made of two strands that twist into a double helix.
c.
 guanine forms hydrogen bonds with adenine.
d.
 thymine forms hydrogen bonds with cytosine.
 29.
The scientists credited with establishing the structure of DNA are
a.
 Avery and Chargaff.
c.
 Mendel and Griffith.
b.
 Hershey and Chase.
d.
 Watson and Crick.
 30.
X-ray diffraction photographs by Wilkins and Franklin suggested that
a.
 DNA and RNA are the same molecules.
b.
 DNA is composed of either purines or pyrimidines, but not both.
c.
 DNA molecules are arranged as a tightly coiled helix.
d.
 DNA and proteins have the same basic structure.
 31.
During DNA replication, a complementary strand of DNA is made from each original DNA strand. Thus, if a portion of the original strand is CCTAGCT, then the new strand will be
a.
 TTGCATG.
c.
 CCTAGCT.
b.
 AAGTATC.
d.
 GGATCGA.
 32.
Which of the following is not true about DNA replication?
a.
 It must occur before a cell can divide.
b.
 Two complementary strands are duplicated.
c.
 The double strand unwinds and unzips while it is being duplicated.
d.
 The new DNA molecule has two newly-made strands.
 33.
The attachment of nucleotides to form a complementary strand of DNA during replication
a.
 is accomplished by DNA polymerase.
b.
 is accomplished only in the presence of tRNA.
c.
 prevents separation of complementary strands of RNA.
d.
 is the responsibility of the proofreading enzymes.
 34.
The enzymes responsible for adding nucleotides to the exposed DNA bases during replication are
a.
 replicases.
c.
 helicases.
b.
 DNA polymerases.
d.
 template enzymes.
 35.
The enzymes that unwind DNA during replication are called
a.
 double helixes.
c.
 forks.
b.
 DNA helicases.
d.
 phages.
 36.
All of the following are true about DNA replication in prokaryotic cells except
a.
 replication begins at many sites along the DNA.
b.
 replication begins at one site along the DNA loop.
c.
 replication occurs in two opposite directions.
d.
 there are two replication forks.
 37.
Transcription, which is a stage of gene expression, is the process by which genetic information encoded in DNA is transferred to a(n)
a.
 RNA molecule.
c.
 uracil molecule.
b.
 DNA molecule.
d.
 tRNA molecule.
 38.
RNA differs from DNA in that RNA
a.
 is double-stranded.
c.
 contains the nitrogen base uracil.
b.
 contains deoxyribose.
d.
 does not contain adenine.
 39.
RNA is chemically similar to DNA except that the sugar in RNA has an additional
a.
 oxygen atom.
c.
 nitrogen base.
b.
 phosphate group.
d.
 carbon atom.
 40.
In RNA molecules, adenine is complementary to
a.
 cytosine.
c.
 thymine.
b.
 guanine.
d.
 uracil.
 41.
Each of the following is a type of RNA except
a.
 carrier RNA.
c.
 ribosomal RNA.
b.
 messenger RNA.
d.
 transfer RNA.
 42.
During transcription,
a.
 proteins are synthesized.
c.
 RNA is produced.
b.
 DNA is replicated.
d.
 translation occurs.
 43.
During transcription, the genetic information for making a protein is “rewritten” as a molecule of
a.
 messenger RNA.
c.
 transfer RNA.
b.
 ribosomal RNA.
d.
 translation RNA.
 44.
Transcription begins when RNA polymerase
a.
 attaches to a ribosome.
b.
 unwinds a strand of DNA.
c.
 binds to a strand of RNA.
d.
 attaches to the promoter sequence of a gene.
mRNA: CUCAAGUGCUUC

nar001-1.jpg
 45.
Refer to the illustration above. What is the portion of the protein molecule coded for by a piece of mRNA with the sequence CUCAAGUGCUUC?
a.
 Ser—Tyr—Arg—Gly
c.
 Leu—Lys—Cys—Phe
b.
 Val—Asp—Pro—His
d.
 Pro—Glu—Leu—Val
 46.
Refer to the illustration above. The anticodons for the codons in the mRNA with the sequence CUCAAGUGCUUC are
a.
 GAG—UUC—ACG—AAG.
c.
 CUC—GAA—CGU—CUU.
b.
 GAG—TTC—ACG—AAG.
d.
 CUU—CGU—GAA—CUC.
 47.
Refer to the illustration above. Which of the following would represent the strand of DNA from which the mRNA strand CUCAAGUGCUUC was made?
a.
 CUCAAGUGCUUC
c.
 GAGTTCACGAAG
b.
 GAGUUCACGAAG
d.
 AGACCTGTAGGA
mRNA codons amino acid
UAU, UAC tyrosine
CCU, CCC, CCA, CCG proline
GAU, GAC aspartic acid
AUU, AUC, AUA isoleucine
UGU, UGC cysteine
 48.
Refer to the illustration above. Suppose that you are given a protein containing the following sequence of amino acids: tyrosine, proline, aspartic acid, isoleucine, and cysteine. Use the portion of the genetic code given to determine which of the following contains a DNA sequence that codes for this amino acid sequence.
a.
 AUGGGUCUAUAUACG
c.
 GCAAACTCGCGCGTA
b.
 ATGGGTCTATATACG
d.
 ATAGGGCTTTAAACA
 49.
The function of rRNA is to
a.
 synthesize DNA.
c.
 form ribosomes.
b.
 synthesize mRNA.
d.
 transfer amino acids to ribosomes.
 50.
At the very beginning of translation, the first tRNA molecule
a.
 binds to the mRNA’s anticodon.
b.
 attaches directly to the DNA codon.
c.
 connects an amino acid to its anticodon.
d.
 binds to the mRNA’s start codon.
 51.
Transfer RNA
a.
 carries an amino acid to its correct codon.
b.
 synthesizes amino acids as they are needed.
c.
 produces codons to match the correct anticodons.
d.
 converts DNA into mRNA.
 52.
Which of the following does not affect the final outcome of gene expression?
a.
 the environment of the cells
b.
 the number of amino acids in the protein being produced
c.
 the presence of other cells
d.
 the timing of gene expression
 

Completion
Complete each statement.
 53.
Griffith’s experiment showed that live bacteria without capsules acquired the ability to make capsules from dead bacteria with capsules in a process Griffith called ____________________.
 54.
Avery’s prevention of transformation using DNA-destroying enzymes provided evidence that ____________________ molecules function as the hereditary material.
 55.
A DNA subunit composed of a phosphate group, a five-carbon sugar, and a nitrogen-containing base is called a(n) ____________________.
 56.
The name of the five-carbon sugar that makes up a part of the backbone of molecules of DNA is ____________________.
 57.
Due to the strict pairing of nitrogen bases in DNA molecules, the two strands are said to be ____________________ to each other.
 58.
Watson and Crick determined that DNA molecules have the shape of a(n) ____________________ ____________________.
 59.
Chargaff’s observations established the ____________________ rules, which describe the specific pairing between bases on DNA strands.
 60.
Watson and Crick used the X-ray diffraction photographs of ____________________ and ____________________ to build their model of DNA.
 61.
The process by which DNA copies itself is called ____________________.
 62.
Enzymes called ____________________ are responsible for unwinding the DNA double helix by breaking the hydrogen bonds that hold the complementary strands together.
 63.
Errors in nucleotide sequencing are corrected by enzymes called ____________________.
 64.
Transcription and translation are stages in the process of ____________________.
 65.
The second stage of gene expression is called ____________________.
 66.
The nitrogen-containing base that is found only in RNA is ____________________.
 67.
The enzyme responsible for making mRNA is called ____________________.
 68.
Messenger RNA is produced during the process of ____________________.
 69.
The sequence of three nucleotides that code for specific amino acids or stop signals in the synthesis of protein is called a(n) ____________________.
 70.
During translation, amino acids are brought to the ribosomes by molecules of ____________________.
 71.
Nucleotide sequences of tRNA that are complementary to codons on mRNA are called ____________________.
 72.
The information contained in a molecule of messenger RNA is used to make protein during the process of ____________________.

 
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Introduction to Biology

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Introduction to Biology

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Course:

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  1. Biology is the study of Minerals Organisms Weather Energy
  2. All organisms possess DNA because DNA creates energy for cells DNA allows sensitivity to environmental stimuli

    DNA contains information for growth & development

    DNA helps capture energy from the sun

  3. Hoeostasis means a slow change over a long period of time Keeping things the same or in balance

    Producing enzymes for metabolism

    Responding to environmental stimuli

Introduction to Biology Quiz 2

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True/False
Indicate whether the sentence or statement is true or false.
1.
Only multicellular organisms use energy for growth and maintenance.
2.
Scientific investigations always follow a series of rigidly defined steps.
3.
Communicating scientific information may result in the development of new hypotheses.
4.
All living things are composed of cells.
5.
In a carefully planned experiment, the variable being studied is omitted from the experimental group.
6.
Scientific understanding is based on observations.
7.
Reproduction is essential for the survival of individual organisms.
8.
The processes of observing, measuring, and organizing data generally lead to the formulation of questions.
9.
Observing is the use of one or more of the senses to perceive objects or events.
10.
The study of biology can help you better understand human reproduction.
11.
Almost all organisms ultimately get their energy for survival from the sun.
12.
A scientist who performs an experiment has no idea what the outcome of the experiment is going to be.
13.
Units of time are not measured in metric units, so time measurements are not accepted for use with SI units.
 

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
14.
The step in a scientific method that is most likely to take the form of an IF_THEN statement is called:
a.
prediciton
c.
experimenting
b.
inference
d.
modeling
15.
The number of frogs in a pond increases each year due to:
a.
homeostasis
c.
organization
b.
reproduction
d.
the food chain
16.
When an experiment gives an important result, these results should not be
a.
published.
c.
replicated.
b.
withheld.
d.
confirmed.
17.
When a hypothesis is tested and confirmed often enough that it is unlikely to be disproved the hypothesis may become a
a.
theory.
c.
replication.
b.
prediction.
d.
scientific method.
18.
Generally, the order in which a scientist uses the scientific method is
a.
observations, predictions, hypothesis, verifying prediction,theory, verification.
b.
observations, hypothesis, making predictions, verifying predictions, performing control
experiments,theory.
c.
predictions, observations, hypothesis, theory, controlled testing,verification.
d.
observations, hypothesis, predictions, verification, theory.
19.
Generally the first process a scientist uses to obtain knowledge about nature is:
a.
collecting
c.
predicting
b.
observing
d.
measuring
20.
Which of the following steps in scientific method is most likely to directly follow
hypothesizing?
a.
communicating
c.
experimenting
b.
inferring
d.
predicting
21.
The part of the scientific method in which journal articles are prepared is called:
a.
communicating
c.
organizing
b.
observing
d.
classifying
22.
A control
a.
is when a lead scientist controls a group of scientists conducting an experiment.
b.
is always registered with the Food and Drug Administration (FDA).
c.
is the part of an experiment in which a key factor is not allowed to change.
d.
provides the answer to a problem posed by a theory.
23.
Biology is the study of
a.
minerals.
c.
the weather
b.
life.
d.
energy.
24.
Which of the following shows the most complex level of organization?
a.
red blood cells
c.
nerve
b.
stomach
d.
muscle
25.
In the scientific method, the step that follows observing and stating a  problem is
a.
recording data.
c.
forming a hypothesis.
b.
analyzing data.
d.
testing a hypothesis.
26.
The splitting in two of a bacterium is called:
a.
inheritance
c.
development
b.
sexual reproduction
d.
asexual reproduction
27.
Plants and algae use energy that comes from
a.
the sun.
b.
the movement of the Earth.
c.
the moon.
d.
heat created deep within the interior of the Earth.
28.
The first living organism on earth was probably a:
a.
single cell
c.
dinosaur
b.
fish
d.
plant
29.
In the scientific method, a possible explanation is called:
a.
hypothesis
c.
an observation
b.
an inference
d.
an analysis
30.
Cell membranes
a.
are only found on a small number of cells.
c.
are made of DNA
b.
contain genes.
d.
are thin coverings that surround cells.
31.
The combining of genetic information from two individuals to produce offspring is called:
a.
inheritance
c.
sexual reproduction
b.
development
d.
asexual reproduction
32.
All organisms possess DNA. DNA
a.
creates energy for the cells.
b.
allows sensitivity to environmental stimuli.
c.
contains information for growth and development.
d.
captures energy from the sun.
33.
Instructions for development that are passed from parents to offspring are known as
a.
a species plan.
c.
genes.
b.
organ codes.
d.
natural selections.
34.
Which of the following is not necessarily a distinct property of living things?
a.
homeostasis
c.
complexity
b.
metabolism
d.
reproduction
35.
Living things
a.
need energy for life processes.
c.
are composed of cells.
b.
have the ability to reproduce.
d.
All of the above
36.
All living things maintain a balance within their cells and the environment through the process of
a.
growth.
c.
homeostasis.
b.
development.
d.
evolution.
37.
Which of the following is not a partial explanation for our lack of understanding of many of the living things on Earth?
a.
Many organisms are microscopic in size and therefore difficult to observe.
b.
Many organisms are so different from other organisms that it is difficult to understand them.
c.
Many organisms live in areas of the world that are difficult to explore.
d.
Tropical rain forests contain many species, and it is difficult to find all of them in these dense forests.
38.
Which example of scientific methodology is incorrect?
a.
Observation—A number of people in Zaire dying of a disease outbreak
b.
Measurement—A record of the number of people with symptoms of the disease and the number of people who had died from the disease
c.
Analysis of data—Comparison of the effects of mixing monkey cells with virus-containing blood in test tubes and the effects of mixing of liquid from these test tubes with fresh monkey cells
d.
Inference making—Identification of the Ebola virus as the cause of the disease by taking electron micrographs of substances found in the blood of persons affected with the disease
39.
The word theory used in a scientific sense means
a.
that of which the scientist is most certain.
b.
a guess made with very little knowledge to support it.
c.
an absolute scientific certainty.
d.
None of the above
40.
A light microscope that has an objective lens of 10´ and an ocular lens of 20´ has a magnification of
a.
30´.
c.
300´.
b.
200´.
d.
2000´.

 
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Graph Example Quiz

%CODE1% Line Graphs Quiz

Click on the radio buttons in front of the correct answers to the questions.

Line Graph of Temperatures

1. This graph shows the temperatures during the period of a

Week Month Year

2. The temperatures in the beginning of the week were rising or falling?

Rising Falling

3. There was the least amount of change between days

6 and 7

5 and 6

1 and two

4. If freezing is 32 degrees, which day was above freezing?

Day 1

Day 2

Day 4

5. When was the greatest drop in temperatures between?

Days 1 and 2

Days 3 and 4

Days 4 and 5

BAR GRAPH QUIZ

Click on the radio buttons in front of the correct answers to the questions about the graph.

Bar Graph

1. In the bar graph above, students favorite activity is

Using the computer

Visitng with friends

Earning money

2. According to the bar graph which is the least favorite after school activity?

Using on the computer

Visitng with friends

Earning money

3. Which two activities are favored by an equal number of students?

Playing sports and earning money

Using the computer and earning money

Talking on the phone and playing sports.

4. How many students said they their favorite after school activity is playing sports?

100 120 140

5. Based on this survey would you say more students like to be around people or be alone after school?

Be alone Be around people

Circle/Pie Graph Quiz

Click on the radio buttons in front of the correct answers to the questions.

Chart of Day's Activities

1. A part of a circle/pie graph that explains the colors that represent each part or slice of the graph is a

legend grid axis

2. These two activities took up half of the time of the day.

Entertainment and school

Meals and school

Sleep and school

3. These two activities took up the least amount of time.

Sleep and school

Meals and homework

Sleep and job

4. Which of these took up one fourth of the day?

Entertainment

Sleep

Homework

5. What percent of the day does homework take up?

2 8 25

6. Which of these takes up the same amount of time as meals and entertainment together?

Job

School

Homework