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medical sciences
biology

Questions and Answers of Biology

Jacob, Monod, and Pardee constructed a mutant strain of E. coli that carried a lacI- gene mutation (encodes the lac repressor). Which is TRUE of this mutant strain? a. Transcription of the lac
Which of the following is NOT one of the major characteristics of the immune system? A. recognizes and responds quickly to an antigen to which it has responded previously. B. responds
Develop one argument in support of or refuting the following statement: “Viruses are living microorganisms.
The following is an excerpt from a news article: “Dr. Miller suggests that the germicidal effect may be due to inhibition of protein synthesis. He and his research associates are now set to test
Discuss three examples of how humans utilize microbes and their products today.
Discuss how the findings of Louis Pasteur may have inspired Joseph Lister’s development of aseptic techniques in surgical settings.
Compare and contrast the Woese-Fox system with the Whittaker system of classification, discussing how genetic analysis provided information leading to the identification of a third cell lineage.
Differentiate the terms emerging disease and reemerging disease, providing examples of each.
Based upon your reading of Insight 1.1, conduct additional research and discuss the current policy on infectious disease quarantine and how this process is administered in the United States.
You are a scientist researching West Nile virus, a mosquito-borne pathogen. You note that the number of cases of West Nile disease in your county skyrocketed to their highest levels ever this past
Support or refute the following statement: “Double bonding provides the plasma membrane with flexibility.”
The burning of coal imparts a large amount of sulfur dioxide into the atmosphere, which, when combined with water, creates sulfuric acid. Explain how such “acid rain” affects the water chemistry
Draw a simple model of the following molecules: CH4, NaCl, H2O. Provide a definition of polar molecule, and identify the polar molecule listed here.
Provide a concise summary of the five basic techniques used to manipulate, grow, examine, and characterize microorganisms in a laboratory.
What is the functional type of mannitol salt agar (MSA)? Explain how it is utilized in the isolation and identification of Staphylococcus species.
You are a scientist studying a marsh area contaminated with PCBs, toxic chemical compounds found commonly in industrial waste. Initial microscopic analysis of the soil reveals the presence of motile
Summarize three isolation techniques. Explain which method is utilized most often in a laboratory and how a colony produced by this method can be used to create a pure culture.
Create a short paragraph to differentiate among the following terms: pure culture, subculture, mixed culture, contaminated culture, and stock culture.
For each of the following scenarios, explain which type of microscope(s) would provide the best image.a. When motility in a live specimen must be viewedb. When intracellular structures must be
a. Create a paragraph to differentiate among the following terms: positive stain, negative stain, simple stain, and differential stain.b. For each of the following scenarios, explain which staining
Define the term ubiquitous and explain whether this term can be used appropriately to describe bacteria and archaea.
Provide examples of at least three different structures used for bacterial attachment and explain which are useful in the formation of bioflms.
Based upon your knowledge of cell wall structure, explain how the microbes causing meningitis and typhoid fever can induce fever and systemic shock in an infected patient.
Compare and contrast main characteristics of the three domains of life: Bacteria, Archaea, and Eukarya.a. Create a branched-tree diagram showing the evolutionary relationship among the three domains
Quorum sensing is a process used by many bacteria for communication. It involves the production of molecules called auto inducers, which act as bacterial chemo attractants. Describe how a motile
a. Describe the characteristics of an endospore-producing bacterium that make it an ideal candidate for bioterrorism but an undesirable intruder in a hospital setting. b. Explain why the production
A microbe has been found in the boiling hot waters of a deep ocean hydrothermal vent. It cannot be readily stained or cultured in the laboratory, but its rRNA has just been sequenced and analyzed. a.
Summarize the endosymbiotic theory and explain how it accounts for major structural similarities and differences between bacterial and eukaryotic cells.
Compare and contrast the structure and function of the following among bacteria and eukaryotes:a. Ribosomeb. Flagellumc. Glycocalyx
Write a paragraph illustrating the life of a protein, from DNA to mature polypeptide, and the course of its travels within a cell throughout its synthesis.
Summarize the general life cycle of a protozoan, explaining the importance of the various stages in disease transmission and species identification.
Sam has been suffering from diarrhea and abdominal bloating for nearly 2 weeks. Based upon the results of his stool analysis in the laboratory, answer the following:a. Single-celled organisms were
Using the analogy that a cell is like a city, describe the anatomy and functions of each of the major eukaryotic organelles in terms of the role it would play within that fictional city.
a. Describe the process of spore formation and explain how a single fungal spore can lead to the development of a mature mycelium.b. Candida albicans is a dimorphic fungus. Explain what is meant by
a. Describe three means of motility exhibited by protozoans.b. Briefly outline the characteristics of the four protozoan groups, listing at least one important pathogen in each group.
a. List the three stages of a complete helminth life cycle and define the role of a definitive host and an intermediate host within this process.b. Discuss at least three major structural adaptations
Provide evidence in support of or refuting the following statement: Viruses are simple cellular agents of disease.
a. You identify a novel microbe in your laboratory and find that it possesses two types of nucleic acid. Explain why you immediately rule out the fact that this microbe is a virus.b. Describe the
Define the term tropism, and provide at least one example illustrating how viral structure determines this property of a virus.
Summarize the method used by most companies to manufacture influenza vaccine today, providing one clear advantage and one disadvantage of this process.
a. Provide at least three examples of noncellular infectious agents that do not display typical viral morphology.b. Of these examples, explain which are associated with the development of human
a. Sketch the basic structure of both a nonenveloped and an enveloped virus, labeling all parts. b. Discuss the validity of the following statement: The viral capsid and envelope only provide
a. Provide one example of an oncogenic virus and explain the unique properties of its multiplication cycle that allow it to trigger the development of cancer.b. Compare and contrast the processes of
a. Why are viral diseases more difficult to treat than bacterial diseases?b. You are a researcher aiming to develop a drug to reduce the multiplication of chickenpox (varicella zoster) virus.Thinking
Provide an example of an organism within each of the four main nutritional categories of microbes and describe how each obtains its essential nutrients.
a. Compare and contrast passive and active forms of transport, providing an example of a molecule transported by each and the basic requirements of each process.b. Describe the process used by a
You are working in a laboratory and are told to prepare a blood sample for microscopic analysis. You prepare a small amount of concentrated blood cells and then suspend the cells in sterile water.
a. Define the three cardinal temperatures for a given microbial species. b. Explain how these temperatures play a role in pathogenicity, or the ability of a microbe to cause disease.c. Illustrate how
a. Define the term osmophile and provide examples of osmophilic microbes living in the environment and on the human body. b. Opening the last jar of strawberry jam that he processed at home last
Define each of the following terms and describe where in or on the body you may find such microbes: -Obligate aerobes anaerobes -Facultative anaerobes aerotolerant anaerobes
Explain what is happening to the bacterial population in the diagram at the top of page 199. Discuss at which point on the graph it would be best to test the effectiveness of a new antibiotic drug.
While preparing food for the class picnic, Morgan introduces 20 bacterial cells into the pasta salad. a. During the 3 hours prior to the picnic, the salad sits at room temperature in the classroom.
What type of ecological association do biofilm communities exhibit? Explain why biofilm infections are so difficult to treat and discuss one potential method for targeting these microbial communities
a. List four characteristics of an enzyme and explain the role each plays in an enzyme’s catalytic activity.b. Diagram an enzyme-substrate reaction involving an apoenzyme, making sure to label the
a. As you learned in previous chapters, fungi are decomposers. Discuss how they might use exoenzymes or endoenzymes to feed.b. Provide brief definitions of constitutive enzyme and regulated enzyme,
a. Describe the chemical properties of ATP that make it suitable as “metabolic money” within a biological cell.b. Compare and contrast the processes of substrate-level phosphorylation, oxidative
a. Compare the main reactions of aerobic respiration, anaerobic respiration, and fermentation in a diagram.b. What are the final electron acceptors in aerobic, anaerobic, and fermentative metabolism?
a. Draw a bacterial cell and a eukaryotic cell side by side. Label where each of the following steps would take place:-Glycolysis-Krebs cycle-Electron transportb. Describe the fate of pyruvic acid in
Summarize how the electron transport chain functions to produce ATP in a bacterial cell versus a eukaryotic cell. Explain whether or not the term chemiosmosis accurately illustrates this process.
Polymerase chain reaction (PCR) is a technology that requires high temperatures to reproduce DNA fragments. Explain why the discovery of thermophilic archaea and their associated DNA polymerases was
a. List two common electron carriers used in biological cells and summarize the role they play in the production of ATP.b. Based upon the information in table, explain which type or types of enzyme
Saccharomyces cerevisiae is used in the production of wine and beer, while Lactobacillus acidophilus is used in the making of yogurt. Explain why each is biochemically suited to the manufacturing of
Explain the relationship among the following terms: genomics, proteomics, gene, protein, genotype, and phenotype.
Provide evidence in support of or refuting the following statement: The life cycle of a retrovirus follows the classical view of the central dogma of biology.
a. Summarize how bacterial and eukaryotic cells differ in gene structure as well as the processes involved in gene expression.b. A new organism was identified by members of your lab. DNA analysis
Sketch a molecule of double- stranded DNA, and explain each of the following:a. Proper nitrogenous base-pairing between the strandsb. Proper orientation of the strandsc. Proper positioning of the
On paper, replicate the following segment of DNA:5′ A T C G G C T A C G T T C A C 3′3′ T A G C C G A T G C A A G T G 5′a. Show the direction of replication of the new strands and indicate the
Compare the structure and functions of DNA and RNA.
The following sequence represents triplets on DNA:3′ TAC CAG ATA CAC TCC CCT GCG ACT 5′Draw a diagram, and describe the following:a. The mRNA codons that correspond to this DNA sequenceb. The
Define the terms redundancy and wobble in terms of gene expression; using your knowledge of these processes, provide another mRNA sequence that could be used to synthesize the same protein as that in
Using the DNA sequence in question 6, illustrate and explain the following mutations:a. A deletionb. An insertionc. A substitutiond. A nonsense mutatione. A frameshift mutation
Use your knowledge of DNA recombination events to complete the following:a. Propose two ways in which antibiotic resistance may develop in a bacterium.b. Explain how transposable elements may be used
You are a public health official trying to determine the identity of the pathogen circulating within your city. Explain which genetic technologies would be most useful in this process.
a. Construct a strand of complementary DNA (cDNA) from the following mRNA transcript:3’-UAUGAACCCCGCUUU-5’b. What enzyme is used to copy DNA from an mRNA transcript, and why is it necessary to
a. Explain whether or not DNA polymerase from a mesophilic bacterium could be used successfully in a PCR reaction.b. If starting with a single double-stranded DNA molecule, how many copies of the DNA
Conduct additional research and provide evidence in support of or refuting the following statement: All forms of gene therapy used today result in heritable changes.
Based on the following image:a. Explain where the charges should be applied to this gel in order for the DNA samples to migrate properly.b. Identify the largest DNA fragment in sample 5. Explain
Summarize the goal of the Human Genome Project and discuss three new fields of science that have developed from this research.
a. Outline the main steps in cloning a gene, explaining how horizontal gene transfer is used in this process.b. Describe one method used to determine whether a bacterial culture has received a
a. Define the term RFLP. Explain how RFLPs are created and why they are useful in DNA analysis.b. In the following DNA profile, identify the pathogen that is making the two patients ill and explain
You work in a laboratory that regularly analyzes patient specimens for the presence of Clostridium difficile.a. Knowing that many specimens test positive, explain which type of antimicrobial chemical
a. Precisely what is microbial death?b. Why does a population of microbes not die instantaneously when exposed to an antimicrobial agent?
a. Discuss the factors that influence an antimicrobial agent’s ability to completely remove microbial contaminants from dentures used on a daily basis.b. Improper cleaning of endoscopes has led to
Compare and contrast the terms bactericidal and bacteristatic in relation to microbial control agents. Develop a simple experimental method that could be used to test whether a control agent exhibits
a. Provide a valid reason for whether or not heat is a selective microbial control agent. b. Explain the concepts of TDT and TDP, and discuss one example of how these measurements can be modified to
a. Explain why desiccation and cold are not reliable methods of disinfection. Discuss how food poisoning can occur through the consumption of frozen food that has been properly stored prior to
For each item on the following list, select the method that will provide proper sterilization of the item without destroying the material or product. You cannot use the same method more than three
Construct a paragraph describing the interrelationship among the microbial pathogen, the affected host, and potential antimicrobial drugs in the development of an appropriate chemotherapeutic
A critically ill patient enters your emergency room, exhibiting signs and symptoms of severe septic shock. In this case, should you immediately begin treatment with a broad-spectrum drug or a
HAART, or highly active antiretroviral therapy, is currently recommended for the treatment of HIV and involves the administration of three or more medicines at one time. Explain why this combined
You have been directed to aseptically obtain a sample from a growth-free portion of the zone of inhibition in a completed Kirby-Bauer test and inoculate it onto a plate of nonselective medium. a.
a. Referring to figure, determine whether the cultured bacterium is sensitive, intermediate, or resistant to each of the antibiotic drugs tested and provide an explanation in each case.b. Referring
a. Is it more beneficial for a drug to be microbistatic or microbicidal? Defend your answer.b. Draw a microbial growth curve, and indicate during which phase an antibiotic should be added to a
Antibiotic-resistance genes, as well as other virulence factor genes, are easily passed between bacterial cells through horizontal gene transfer. a. Conduct additional research and summarize the
A friend was recently diagnosed with strep throat. One week after his treatment, he redeveloped the infection. In conversation, your friend tells you, “I must have become immune to the drug the
Based upon data from the Human Microbiome Project (HMP):a. Provide evidence in support of or refuting the following statement: Babies are born sterile.b. Define microbial antagonism, and discuss how
Trace the path taken by pathogens from various portals of entry, through the establishment of disease, and ending with their exit from various portals in the host.
Discuss the factors that enable the development of healthcare-associated infections. Explain which infection-control measures have been implemented successfully to decrease the spread of these
Dr. John Snow is famous for bringing a cholera epidemic to an end in London by identifying the source of infection as a contaminated water pump used by many in the city. a. Based upon this
Conduct additional research, and then complete the following.a. List historical examples of bioterrorism worldwide.b. Discuss the goal of agroterrorism and potential agents that could be used by an

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