SCI250 Week 7 Final Examination

SCI250 Week 7 Final Examination

SCI250 Week 7 Final Examination

Section: Multiple Choice

  1. Which of the following is NOT true of microorganisms?


  • They produce antibiotics.


  • They are used in the production of many types of food and beverages.


  • They decompose dead animals.


  • They all cause disease in humans.
  1. Which of the following is NOT one of the phases of bacterial growth?


  • lag phase


  • stationary phase


  • doubling phase


  • log phase
  1. Which of the following is NOT a differential stain?
  • Gram stain


  • Schaeffer-Fulton


  • acid-fast stain


  • flagellar stain


  1. In a properly executed Gram stain, Gram positive organisms appear ______ while Gram negative

organisms appear ______

  • pink, clear.


  • pink, purple.


  • purple, pink.


  • purple, blue.


  1. Classification is necessary to _________
  • establish criteria for identifying organisms.


  • arrange related organisms into groups.


  • provide information about how organisms evolved.


  • All of the above
  1. An organism that lives at the expense of another organism is a ________
  • host.
  • commensal.
  • parasite.
  • symbiont.
  1. Undercooked pork is most likely to pass along ________
  • Schistosoma.
  • Taenia.
  • Wuchereria.
  • Trichinella.


  1. Arthropods are responsible for transmitting _____ pathogens.
  • viral
  • bacterial
  • protozoan
  • viral, bacterial, and protozoan
  1. Symbiosis is an association between ________
  • two or more species.
  • one or two species.
  • two or more hosts.
  • no species but all hosts.
  • all species but not hosts.
  1. All of the following are true of the relationship between microorganisms and diseases EXCEPT:


  • Sickle cell anemia patients are resistant to malaria.
  • Bacterial infections can lead to endocarditis.
  • Viral infections invariably lead to nutritional deficiency.
  • Infections in the brain can result in mental disease.
  1. Which of the following represents the correct order of steps in a typical viruses replication cycle?
  • Maturation, adsorption, penetration, release
  • Adsorption, penetration, release, maturation
  • adsorption, penetration, synthesis, maturation
  • Adsorption, penetration, maturation, synthesis
  1. What special group of chemical substances are used to treat diseases by microbes?
  • Antibiotics
  • Synthetic drugs
  • semi-synthetic drugs
  • Antimicrobial agents
  • Chemotherapeutic agents
  1. Which of the following is NOT considered a mode of action by antimicrobial agents?
  • Action as an antimetabolite
  • Inhibition of protein synthesis
  • Inhibition of cell wall synthesis
  • Inhibition of membrane permeability
  • Disruption of selective toxicity
  1. All of the following characteristics are components of nonspecific host defenses EXCEPT:
  • Fever
  • Mucus
  • Antibodies
  • Interferon
  • Inflammation
  1. What name is given to a substance that is recognized by the body as foreign and normally produces an immune response?
  • Antibody
  • Antigen
  • Agglutinin
  • Antitoxin
  • Apoptosis
  1. There are a number of different species that can live on the skin as resident microflora. Which of the following is NOT considered resident microflora of the skin?
  • Staphylococcus
  • corynebacterium
  • E. coli
  • Demodex
  • All of the above
  1. Defense mechanisms in the urogenital system are numerous and include ________
  • normal flora complete with opportunists.
  • sphincter muscles.
  • flushing action of fluids.
  • low pH.
  • All of the above
  1. Food poisoning can be caused by a variety of microbes. Which of the following pairs is incorrect?
  • Clostridium botulinum — enterotoxin which is heat liable
  • Staphylococcus aureus — enterotoxin which is heat stable
  • Pseudomonas cocovenenans — bongkrek disease
  • Bacillus cereus — toxin is an emetic
  • Clostridium perfringens — enterotoxin and wound infection
  1. The upper respiratory tract consists of the ________
  1. pharynx.
  1. asal cavity.
  1. bronchi.
  1. All of the above
  1. Only A and B
  1. Group B Streptococcal disease include ________




  1. early onset neonatal sepsis and meningitis.




  1. late onset neonatal meningitis.




  1. etiology is Streptococcus agalactiae.




  1. All of the above




  1. Only A and C




  1. In closed environments, such as military bases, dormitories, and day-care centers, 90% of the population




can be carriers of this organism, yet only 1 per 1000 develops the meningitis. What is the etiology?






  • Neisseria meningitidis




  • Haemophilus influenzae




  • Streptococcus pneumoniae



  • Listeria monocytogenes
  1. Food contamination occurs as a result of ________
  1. unsanitary practices by food handlers.
  1. improper storage.
  1. importation.
  1. All of the above
  1. Only A and B

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