Life Sciences Practice Exam
Course Introduction
Life Sciences is an interdisciplinary field that explores the structure, function, growth, origin, evolution, and distribution of living organisms. This course covers fundamental biological principles, including cell biology, genetics, physiology, ecology, and evolution. Students will gain an understanding of how living systems interact with each other and their environments, as well as the molecular mechanisms that drive life processes. Through lectures, laboratory work, and real-world examples, learners will develop critical thinking skills and a scientific mindset necessary for further study and innovation in health, environmental science, and biotechnology.
Recommended Textbook
Living in a Microbial World 1st Edition by Bruce Hofkin
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16 Chapters
208 Verified Questions
208 Flashcards
Source URL: https://quizplus.com/study-set/3902
Page 2
Chapter 1: Living in a Microbial World
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13 Verified Questions
13 Flashcards
Source URL: https://quizplus.com/quiz/77693
Sample Questions
Q1) Which typical characteristics of living things are not observed in viruses?
Answer: Viruses are not composed of cells. They are unable to replicate outside the cells of other organisms and they have little if any independent metabolism.
Q2) Cells have the ability to maintain internal conditions within ranges compatible with life. This ability is called:
A) homeostasis.
B) evolution.
C) metabolism.
D) environmental response.
Answer: A
Q3) Which of the following statements is true?
A) Most microorganisms have eukaryotic cells.
B) Most microorganisms have cells containing organelles.
C) Many microorganisms have cells in which the genetic material is not surrounded by a nuclear membrane.
D) Animals have prokaryotic cells.
E) Plant cells do not contain organelles.
Answer: C
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3
Chapter 2: The Chemistry of Life
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13 Verified Questions
13 Flashcards
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Sample Questions
Q1) Enzymes function by ________, which speeds up the rate of a chemical reaction.
A) increasing the stability of the reactants
B) multiplying the number of active sites on the reactants
C) lowering the energy of activation
D) increasing the energy of activation
E) keeping the pH constant
Answer: C
Q2) Which of the following statements is correct?
A) A base is a H<sup>+</sup> ion donor.
B) Pure water is completely neutral and has a pH of 0.
C) As the concentration of H<sup>+ </sup>goes up, the pH also goes up.<sup> </sup>
D) If the hydroxyl ions outnumber the H<sup>+</sup> ions, the pH will be less than 7.0.
E) Bases reduce the concentration of H<sup>+</sup> in water.
Answer: E
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Chapter 3: The Cell: Where Life Begins
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13 Verified Questions
13 Flashcards
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Sample Questions
Q1) ________ is/are composed of long, slender protein filaments and act(s) as a type of scaffolding for eukaryotic cells.
A) The cilia
B) The cytoskeleton
C) The endoplasmic reticulum
D) The endomembrane system
E) The endospore
Answer: B
Q2) Which of the following is released by dying Gram-negative bacteria, whereupon it acts as endotoxin?
A) peptidoglycan
B) O-polysaccharides
C) porin proteins
D) pentaglycine
E) lipopolysacharides
Answer: E
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Chapter 4: A Field Guide to the Microorganisms
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13 Verified Questions
13 Flashcards
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Sample Questions
Q1) Which of the following is true about photosynthetic bacteria?
A) They are the most primitive of all bacteria.
B) Photosynthesis appears to have evolved several separate times.
C) Photosynthetic bacteria all appear to be closely related.
D) A comparison of rRNA genes in different lineages of photosynthetic bacteria would reveal that the genes are almost identical in all lineages.
E) All photosynthetic bacteria appear to have evolved relatively recently.
Q2) What are mycorrhizial relationships? Provide an example.
Q3) In which of the following ways are prions believed to differ from all other infectious agents?
A) Unlike any other infectious agents, they are acellular.
B) Unlike any other infectious agents, they can infect many different species of hosts.
C) Unlike any other infectious agents, are able to reproduce without any nucleic acid.
D) Prions appear to be unusual viruses that have both DNA and RNA.
E) Unlike other infectious agents, which are found only in specific host tissues, prions have the ability to infect any tissue in a host's body.
Q4) How are rRNA genes used to deduce evolutionary relationships?
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Chapter 5: The Microbiology of History and the History of Microbiology
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13 Verified Questions
13 Flashcards
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Sample Questions
Q1) Why is a large population of hosts more important for the maintenance of a "crowd disease" than it is for other types of diseases?
Q2) Which of the following factors was cited as a contributing cause to the end of the English feudal system?
A) a labor shortage caused by high mortality due to the "black death"
B) a disruption of transport in England caused by a fear of smallpox
C) a still unidentified disease outbreak that preferentially killed landowners
D) a series of very wet years that promoted increased mosquito numbers, and therefore an epidemic of malaria
E) an outbreak of a serious plant pathogen that caused crops to fail, initiating a famine
Q3) What are Koch's Postulates? Explain how they are used to determine the cause of a particular disease.
Q4) What is the danger associated with agricultural monocultures?
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Chapter 6: Microbial Genetics
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13 Verified Questions
13 Flashcards
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Sample Questions
Q1) ________ use(s) codons to specify which amino acid should be added to the growing polypeptide chain during protein synthesis.
A) DNA
B) mRNA
C) tRNA
D) rRNA
E) operons
Q2) Identify and describe three distinct ways in which genetic recombination occurs in bacteria.
Q3) The region of the DNA to which RNA polymerase binds during transcription is known as the ________.
A) promoter
B) codon
C) anticodon
D) operator
E) origin of replication
Q4) How does "proofreading" by DNA polymerase occur during DNA replication?
Q5) Explain how RNA differs in structure from DNA.
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Chapter 7: Metabolism and Growth
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13 Verified Questions
13 Flashcards
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Sample Questions
Q1) A chemically defined medium is often required to grow ________ bacteria in the laboratory.
A) fastidious
B) non-fastidious
C) acidophilic
D) halophilic
E) microaerophilic
Q2) A bacterial species never uses oxygen as a final electron acceptor. However, it has the enzymes necessary to degrade toxic forms of oxygen. Such a bacterial species is an example of:
A) an obligate aerobe.
B) an obligate anaerobe.
C) a facultative anaerobe.
D) an aerotolerant anaerobe.
E) a microaerophile.
Q3) Describe how ATP is produced in electron transport.
Q4) Describe differences that would be seen in the growth curve of a facultative anaerobe that is grown in the presence of oxygen, and the same facultative anaerobe grown in the absence of oxygen.
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Chapter 8: Microbial Evolution: the Origin and Diversity of Life
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13 Verified Questions
13 Flashcards
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Sample Questions
Q1) The idea that sexual reproduction evolved as a way to increase genetic diversity in a population, rendering that population less vulnerable to pathogens, is called:
A) the sexual selection hypothesis.
B) the artificial selection hypothesis.
C) the red queen hypothesis.
D) the white rabbit hypothesis.
E) the pathogen vs. host hypothesis.
Q2) Why is it that natural selection can never result in organisms that are perfectly adapted to their environment?
Q3) Molecules composed of RNA that have enzymatic activity are known as:
A) ribosomes.
B) RNases.
C) catalases.
D) ribozymes.
E) nucleases.
Q4) It is believed that mitochondria were acquired by primitive eukaryotic cells before chloroplasts were. What is the evidence for this?
Q5) Explain the rationale for the "RNA world" hypothesis.
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Chapter 9: An Ecologists Guide to Microbiology
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13 Verified Questions
13 Flashcards
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Sample Questions
Q1) Mycorrhizal associations would most likely be found in:
A) benthic marine environments.
B) a freshwater lake.
C) a stream or river.
D) the soil environment.
E) microbial biofilms.
Q2) Describe why decomposers are so important in ecosystems.
Q3) In aquatic environments, the ________ zone represents the part of the environment where sunlight reaches the bottom.
A) photic zone
B) littoral zone
C) profundal zone
D) benthic zone
E) pelagic zone
Q4) Most of the bacteria that live in lakes can be classified as:
A) oligotrophs.
B) eutrophs.
C) Gram-positive.
D) Gram-negative.
E) thermophiles.
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Chapter 10: The Nature of Disease: a Pathogens Perspective
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13 Verified Questions
13 Flashcards
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Sample Questions
Q1) Streptokinase, coagulase, and hemolysins are all examples of:
A) exotoxins.
B) endotoxins.
C) tissue degrading enzymes.
D) viral cytopathic effects.
Q2) In terms of how a pathogen might affect a host, which of the following is the correct sequence of events?
A) contamination » disease » infection
B) disease » contamination » infection
C) infection » contamination » disease
D) infection » disease » contamination
E) contamination » infection » disease
Q3) In a latent viral infection:
A) there is rapid viral replication in an infected cell.
B) there is slow viral replication in an infected cell.
C) there is no viral replication in an infected cell.
D) numerous inclusion bodies are visible in the cytoplasm of an infected cell.
E) we expect oncogenes to be activated, leading to tumor formation.
Q4) How does our normal flora protect us from some infections by pathogens?
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Chapter 11: Host Defense
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13 Verified Questions
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Sample Questions
Q1) Which antibody type is usually produced in the greatest amount during a humoral reponse?
A) IgA
B) IgD
C) IgM
D) IgE
E) IgG
Q2) Toll-like receptors:
A) permit certain innate immune system cells to recognize certain molecules that are unique to microorganisms.
B) are found on the surface of cytotoxic T cells, and are used to recognize infected cells.
C) present foreign antigens on the surface of macrophages and dendritic cells.
D) are found on the surface of helper T cells, where they recognize antigens presented by antigen presenting cells.
E) are used by macrophages and dendritic cells to signal helper T cells that an infection is under way.
Q3) In what way can the fever response be used to illustrate the point that response to pathogens can both be protective and harmful?
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13
Chapter 12: Control of Microbial Growth
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Sample Questions
Q1) If the number of microorganisms must be reduced in a beverage that cannot be subjected to high temperatures, ________ would be an effective control method.
A) pasteurization
B) autoclaving
C) filtration
D) the addition of heavy metals
Q2) Sulfa drugs:
A) act by interfering with cell wall synthesis.
B) bind to and interfere with bacterial ribosomes.
C) interfere with bacterial DNA replicaton.
D) interfere with the activity of a bacterial enzyme.
E) disrupt the production of mycolic acids by acid-fast bacteria.
Q3) Pasteurization:
A) is a technique used to sterilize liquids.
B) relies on high temperature and high pressure to kill microorganisms.
C) can be considered to be a bacteriotatic control measure.
D) selectively kills thermophiles in liquids.
E) selectively kills mesophiles in liquids.
Q4) What are some of the problems associated with the development of antiviral drugs?
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Chapter 13: Epidemiology: Who,
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Sample Questions
Q1) In the 1999 West Nile virus outbreak in New York City, which of the following pieces of evidence suggested that the pathogen under investigation was not St. Louis encephalitis (SLE)?
A) The time characteristic was not suggestive of SLE.
B) There was no mosquito involvement in this disease, as there would have been for SLE.
C) The viral particles were too small to be SLE.
D) Control measures initiated to control a SLE outbreak were not effective.
E) The case-control study indicated that this was not SLE.
Q2) The likelihood of a host-to-host epidemic is highest when:
A) the proportion of immune individuals in a population is below the epidemic threshold.
B) the proportion of immune individuals in a population is above the epidemic threshold.
C) the proportion of immune individuals in a population is at the epidemic threshold.
D) anytime the proportion of immune individuals in a population rises above 50%.
E) the second time a pathogen is introduced into a particular population.
Q3) How can a vaccine program prevent epidemics?
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Page 15
Chapter 14: The Future Is Here: Microorganisms and Biotechnology
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13 Verified Questions
13 Flashcards
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Sample Questions
Q1) A foreign gene is incorporated into a virus, creating a recombinant virus. The virus is now allowed to infect certain cells, with the hope that the foreign gene carried by the virus will be incorporated into the DNA of the cells. Which of the following is true?
A) The virus is the cloning vector.
B) The cells are the cloning vectors.
C) The virus is the cloning host.
D) Both "a" and "c" are correct.
E) Both "b" and "c" are correct.
Q2) Which of the following is not added to the reaction mix in the polymerase chain reaction?
A) a DNA polymerase enzyme
B) appropriate primers
C) target DNA
D) a supply of DNA nucleotides
E) a gene probe
Q3) What is the polymerase chain reaction? Briefly state how it works.
Q4) One of the concerns about genetically modified plants is how they might affect wild plants. In what way? Why is this worrisome?
Q5) What exactly is a DNA library? What is a genomic library?
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Chapter 15: Guess Whos Coming to Dinner: Microorganisms and Food
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13 Verified Questions
13 Flashcards
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Sample Questions
Q1) Microbial fermentation only occurs under certain environmental conditions. Why, in terms of metabolism, do these organisms ferment under such conditions?
Q2) Microbial fermentation of food products occurs when the microorganisms are allowed to grow:
A) in an anaerobic environment.
B) in an aerobic environment.
C) in an acidic environment.
D) at low temperatures.
E) at high temperatures.
Q3) Which of the following is an example of single-cell protein?
A) yogurt
B) cheese
C) Spirulina
D) beer
E) summer sausage
Q4) In what way is the production of vinegar different from the production of the fermented food products discussed in this chapter?
Q5) Provide a biochemical explanation for why bread rises during its production.
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Chapter 16: Better Living With Microorganisms: Industrial and Applied Microbiology
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13 Verified Questions
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Sample Questions
Q1) The easiest step when it comes to developing a new antibiotic is:
A) finding a microorganism that produces an antibiotic.
B) determining the optimum growth conditions for the microorganism in question.
C) the scale-up process.
D) improving the bacterial strain so that commercially valuable quantities of the antibiotic are produced.
Q2) Which type of organism would be most promising if you were seeking an organism that can digest hydrocarbons, to help clean up oil spills?
A) a nonfastidious organism
B) a fastidious organism
C) an obligate anaerobe
D) an extreme thermophile
E) an acidophile
Q3) Which of the following statements about landfills is true?
A) Decomposition of garbage is slowed by anaerobic conditions.
B) Decomposition of garbage is slowed by aerobic conditions.
C) Decomposition of garbage is slowed by toxic chemicals, which kill microorganisms.
D) Decompostion of garbage is slowed by the release of methane.
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