Western Governors University (WGU) NURS1010 D311 Microbiology with Lab: A Fundamental Approach Practice Exam

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• Which microbial structure is primarily responsible for resisting extreme conditions and enabling persistence in harsh environments?
• When is it most appropriate to use a narrow-spectrum antimicrobial instead of a broad-spectrum one?
• What is a potential consequence of disrupting the normal microbiota with broad-spectrum antibiotics?
• Which statement about DNA viruses is true?
• How does transformation differ from transduction in horizontal gene transfer?
• What role do adhesins play in virulence?
• What distinguishes a primary pathogen from an opportunistic pathogen?
• What feature explains why Gram-positive bacteria retain the crystal violet-iodine complex during Gram staining?
• What is the MIC and how is it used clinically?
• Which statement about the Gram stain mordant is true?
• Which process is primarily responsible for the division of prokaryotic cells?
• What general mechanism do macrolides use to inhibit bacterial growth?
• Which set lists the three major mechanisms by which bacteria acquire new genes?
• Which organism is a common cause of urinary tract infections in hospitalized patients, and what are the associated risk factors?
• Ziehl-Neelsen staining is used to detect acid-fast organisms (e.g., Mycobacterium). What color do acid-fast cells appear after staining?
• Which statement best defines an operon in bacteria?
• Which Gram-positive diplococci are commonly associated with pneumonia?
• Which disease is commonly caused by Cryptococcus neoformans?
• Which of the following statements best describes the chain of infection?
• Define BSL-1 and BSL-2 with examples of agents.
• Compare replication strategies of DNA viruses versus RNA viruses.
• How do sulfonamides exert their antibacterial effect?
• What will a student observe under the microscope after failing to apply heat during the endospore stain of Bacillus anthracis?
• Which statement accurately describes autoclave sterilization and its standard parameters?
• Sporulation and germination refer to which bacterial processes?
• Which organism is commonly associated with aspergillosis?
• Which of the following best describes the genetic material of prokaryotic cells?
• Which class of cells most often contain extrachromosomal DNA found in plasmids?
• What is the role of the normal microbiota in health?
• Name the three basic bacterial shapes and provide an example for each.
• What best describes a plasmid in bacteria?
• What should the World Health Organization do first when managing the spread of a novel epidemic disease?
• What diagnosis is appropriate when a bacterial pathogen is found growing in the bloodstream of a patient?
• How do beta-lactam antibiotics kill bacteria?
• An endospore is:
• An operon yields a single polycistronic mRNA transcribed from one promoter that coordinates multiple genes.
• What is the process called when leukocytes pass through the walls of small capillary blood vessels to reach infected tissues?
• After oral antibiotic therapy, which type of microbe could likely cause vaginitis?
• What type of disease transmission involves the spread of pathogens through contaminated surfaces?
• Define transduction in bacterial genetics.
• Which ribosome type is found in bacteria and is a common target of many antibiotics?
• Why are biofilms clinically important in infections and antibiotic resistance?
• Which of the following is a characteristic feature of biofilms?
• During which growth phase is the cell division rate at its maximum?
• Which organism produces cholera toxin, an exotoxin?
• Which of the following statements is true about prokaryotic organisms?
• Which component is primarily responsible for the outer membrane of Gram-negative bacteria and contributes to endotoxin activity?
• Why do aseptic techniques prevent contamination of a patient by microbes and infectious agents?
• Endotoxin exposure can lead to which clinical outcome?
• What role do leukocytes play in the immune response?
• In standard steam sterilization, which option correctly describes the use of temperature, pressure, and time?
• Which structure within archaea is primarily responsible for their ability to withstand extreme conditions?
• Which factor primarily explains the differential coloring in Gram staining?
• Which statement about hand hygiene in aseptic technique is correct?
• What bacterial target do fluoroquinolones inhibit?
• Which statement about the citric acid cycle is true?
• Name two common bacterial virulence factors and their role.
• Which type of immunity is primarily stimulated by live attenuated vaccines?
• Which nutrient category defines carbon and energy sources, nitrogen, and minerals required by bacteria?
• Define sterilization and disinfection; provide one method for each.
• After Gram staining, what color do Gram-negative bacteria appear?
• What is a key requirement of effective hand hygiene in healthcare?
• Which of the following statements correctly reflects a vaccine strategy against bacterial infections?
• What best describes the content of plasmids in bacteria?
• Which exotoxin-related statement is correct?
• Which disease is specifically targeted by the Hib vaccine?
• Define transformation in bacterial genetics.
• What is the main component that constitutes the cell wall of archaea?
• What is a characteristic of an opportunistic pathogen?
• Fluoroquinolones inhibit a process essential to bacterial replication by targeting DNA gyrase. What is the consequence?
• During semi-conservative DNA replication in bacteria, each daughter DNA molecule contains which of the following?
• In a standard Gram stain, which color do Gram-positive bacteria appear after completing the stain?
• Why is ergosterol targeted by antifungals?
• What is ergosterol and why is it a drug target?
• What is the role of iodine in the Gram stain?
• What method can be used to quickly reestablish the microbiome and prevent a Clostridium difficile infection?
• Describe three common mechanisms by which bacteria acquire antibiotic resistance.
• Briefly describe the Kirby-Bauer disk diffusion assay and result interpretation.
• What makes diseases like Legionnaires' disease noncommunicable?
• Which statement about glycolysis is true?
• Which organism type does not use oxygen but tolerates it?
• How was a pathogen transmitted when an infected individual coughs in a subway car, and another develops symptoms two days later?
• Describe the chain of infection and its six components.
• What type of microbial control is used to remove most microbes from the kitchen counter in a restaurant?
• Which feature is present in Gram-negative bacteria but absent in Gram-positive bacteria?
• Why are biofilms particularly challenging in clinical infections?
• What function do antiseptics serve regarding microbial presence?
• A patient presents with an infection on an implant. What should the clinician consider in planning the treatment course?
• Why are photosynthetic bacteria and algae important to the carbon cycle?
• What is the role of plasmids in bacteria, including copy number and typical content?
• Which conditions favor sporulation, and which genera are well known for forming spores?
• Distinguish sterilization from disinfection and give an example of each.
• Which infection is commonly associated with antibiotic use leading to pseudomembranous colitis?
• Which method is a classic example of sterilization?
• Which sequence describes the lytic cycle of a bacteriophage?
• Which statement best describes archaea?
• Provide an example of antibiotic synergy.
• Which organism is commonly used as an example of a moderately hazardous agent suitable for BSL-2?
• What is the primary role of broad-spectrum antibiotics in microbiome disruption?
• Which organism type does a conjugate vaccine target?
• Which of the following is an example of disinfection rather than sterilization?
• What is a virulence factor?
• What is a common environment where archaea are found?
• Which of these is primarily responsible for the development of iatrogenic infections?
• What microbial process is utilized by bacteria and fungi to create products like soy sauce and bread?
• Why is desiccation or dehydration an effective method of microbial control?
• Which statement correctly describes the lac operon and its regulation?
• Components that comprise innate immunity against microbial invasion include?
• What type of media contains nutrients that support growth of fastidious organisms and is not solely selective or differential?
• What is the primary purpose of aseptic technique in microbiology labs?
• What distinguishes prokaryotic cells from eukaryotic cells?
• What type of microbe is Bacillus anthracis?
• Which statement best describes quorum sensing in bacteria?
• Which molecule is essential for maintaining the structure of the cell membrane?
• Which virulence factor produced by Pseudomonas aeruginosa is known for its fruity odor?
• What type of culture media contains substances that inhibit some organisms while allowing others to grow?
• After completing the Gram stain, Gram-positive bacteria typically appear as which color?
• How does coinfection of a single cell by multiple strains of a virus increase its pathogenicity?
• Which statement best defines selective toxicity and provides an antibiotic example?
• What is the role of the extracellular matrix in biofilm formation?
• Which colony morphology features are used to help identify bacterial species on culture plates?
• Which microorganisms are known to produce human pathogens that spread via microsporidia?
• Which statement best differentiates colonization from infection in wound care?
• How would an infection characterized by swelling and redness at an incision site post-surgery be classified?
• An infection by a pathogen that occurs several years after the first elicits a faster response from lymphocytes. What explains this faster response to a second infection?
• Compare cell wall structure between Gram-positive and Gram-negative bacteria.
• List three classes of antibiotics that inhibit bacterial cell wall synthesis and a representative drug for each.
• Name the four types of hypersensitivity and a brief example of each.
• What is the primary purpose of the bacterial growth curve's log phase?
• Which enzyme unwinds the DNA double helix during replication?
• Why do antiviral drugs target specific steps in the viral life cycle?
• Acid-fast staining is used to detect which group of organisms?
• Which statement best describes innate immunity?
• Which enzyme is inhibited by sulfonamides in the folate synthesis pathway?
• Which statement about RNA viruses is true?
• What role does contact tracing play in disease prevention?
• What term describes the human microbial community that normally inhabits surfaces and mucous membranes?
• What is a nosocomial infection?
• Which process regenerates NAD+ under anaerobic conditions to sustain glycolysis?
• What is quorum sensing and why is it important in bacterial pathogenesis?
• In wound microbiology, which statement best differentiates colonization from infection?
• Name a common antibiotic that inhibits cell wall synthesis and a typical example.
• How do viruses differ from bacteria in terms of cellularity and replication?
• How do surgical masks and N95 respirators prevent microbial transmission?
• Provide three examples of fungal pathogens and a disease caused by each.
• Why is hand hygiene crucial in preventing healthcare-associated infections?
• How does transcription in bacteria differ from eukaryotic transcription in terms of location and RNA processing?
• What are the essential practices of aseptic technique in a microbiology lab?
• Which statement about MacConkey agar is true?
• During the Gram stain, what happens to Gram-negative bacteria during the decolorization step with alcohol?
• How do antiseptics differ from antibiotics in their scope and target?
• What does MRSA stand for?
• Which method of physical microbial control can be used to sterilize fresh food?
• Which term describes microbes that reside on the host without causing disease under normal conditions?
• Kirby-Bauer disk diffusion testing yields what measurement to indicate antibiotic susceptibility?
• Why might a fungal infection occur after antibiotic treatment?
• What is a direct result of the increased "leakiness" of capillaries during inflammation?
• What type of media differentiates organisms based on a biochemical trait, such as lactose fermentation?
• What is the purpose of vaccination in infection control?
• Endotoxin is a component of bacteria that can trigger what clinical effect?
• What viral virulence factor requires annual adjustments to the influenza vaccine?
• Define conjugation in bacterial genetics.
• Which type of transmission describes a parent catching the common cold virus when caring for their sick child?
• What is the correct order of steps in the Gram stain and the purpose of each step?
• What type of microbe is used to deliver gene therapies to human cells?
• Which of the following are examples of virulence factors?
• What is the Gram stain appearance and typical arrangement of Staphylococcus aureus?
• Name the phases of the bacterial growth curve.
• Kirby-Bauer disk diffusion testing is used for what purpose?
• What is the most common portal of exit for diseases transmitted by vectors, such as West Nile virus?
• Name three common differential/selective culture media and what they indicate.
• What is the primary role of helper T cells in the immune response?
• Why is identifying the specific infectious agent crucial for selecting the appropriate antimicrobial?
• Which statement best differentiates innate and adaptive immunity?
• Which staining technique can identify microorganisms that may cause canned food to spoil and create dangerous containers?
• Which vaccine type has the advantages of producing long-lasting cellular and humoral immunity and allowing transmission to contacts?
• Acid-fast staining is used to detect which organisms?
• What is antimicrobial resistance and give an example of a resistant organism.
• Which of the following is TRUE regarding the use of fecal transplants?
• What does BSL stand for, and what type of agents are typically contained at BSL-2?
• How do lactic acid fermentation and aerobic respiration differ in ATP yield and final electron acceptor?
• Which statement best describes Gram-positive versus Gram-negative regarding outer membranes?
• What beneficial role do viruses play in the environment?
• What makes MRSA more pathogenic compared to other Staphylococcus aureus strains?
• Which virulence factor of Staphylococcus aureus helps immune evasion by binding the Fc portion of IgG?
• Differentiate humoral immunity from cell-mediated immunity.
• Which statement describes the difference between bacterial and eukaryotic ribosomes and its relevance to antibiotic selectivity?
• Which media differentiates Staphylococcus species and differentiates S. aureus by mannitol fermentation?
• Why are archaea considered prokaryotic organisms?
• What are the main routes of transmission for respiratory pathogens?
• Which organism is implicated if type 1 fimbriae are used to attach to intestinal epithelial cells?
• What is the correct sequence of steps in the basic Gram stain procedure?
• Name at least two vaccines that prevent bacterial infections and the diseases they target.
• What is the role of penicillin-binding proteins in bacterial cell wall synthesis?
• What target would appropriately treat a fungal skin infection?
• What is the primary consequence of "leaky" capillaries during inflammation?
• What is the clinical significance of the coagulase test?
• What is the difference between humoral and cellular adaptive immunity?
• Which microorganisms produce dermatophytes that can cause skin infections, such as athlete's foot and ringworm?
• Why is the study of biofilms important in clinical microbiology?
• What is antibiotic stewardship and its goal?
• Which statement correctly differentiates aerobes, anaerobes, facultative anaerobes, and aerotolerant organisms?
• If a five-year-old child is exposed to pertussis after the mother declined boosters, what will occur?
• Contrast endotoxins and exotoxins; provide a representative organism for each.
• How do viruses benefit agriculture?
• Distinguish between an antiseptic and a disinfectant with an example of each.
• What type of diseases are found in higher numbers than expected in local populations?
• Which immune component activates B cells to produce antibodies?
• Which cell wall feature primarily provides rigidity to Gram-positive bacteria?
• What are the three main modes of horizontal gene transfer in bacteria?
• Which statement best describes a mutation and its typical protein-level consequences?
• What is a likely explanation for how a disease spread at a birthday party where nearly everyone who attended became sick?
• What is the term for the initial phase of the immune response when pathogens are recognized?
• What is significant about the molecule that makes up the bilayer in the plasma membrane of cells?
• A person who is allergic to components of a vaccine is still protected from contracting a virus due to the vast majority of the surrounding population being vaccinated. What is this phenomenon called?
• Why is a Gram stain unsuitable for mycobacterium?
• A technician has just performed a Gram stain but forgot to add the safranin. What is the likely result of this stain when viewed microscopically?
• When can narrow-spectrum antibiotics be used to treat infectious diseases effectively?
• What result indicates successful fermentation in a laboratory setting?
• How do biofilms typically react to antibiotic treatment?
• Which mechanism uses bacteriophages to transfer DNA between bacteria?
• Which organism is a Gram-positive cocci commonly implicated in hospital-acquired infections?
• Which of the following is a common mechanism by which bacteria develop antibiotic resistance?
• Compare autoclave sterilization with dry heat sterilization.
• Which energy-yielding pathway uses oxygen as the final electron acceptor?
• Which scenario best illustrates a mutualistic relationship?
• What factor has contributed to the resurgence of whooping cough and measles in the U.S.?