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.

2. Which of the following is NOT one of the phases of bacterial growth?

 

• lag phase

 

• stationary phase

 

• doubling phase

 

• log phase

3. Which of the following is NOT a differential stain?

• Gram stain

 

• Schaeffer-Fulton

 

• acid-fast stain

 

• flagellar stain

 

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

organisms appear ______

• pink, clear.

 

• pink, purple.

 

• purple, pink.

 

• purple, blue.

 

5. Classification is necessary to _________

• establish criteria for identifying organisms.

 

• arrange related organisms into groups.

 

• provide information about how organisms evolved.

 

• All of the above

6. An organism that lives at the expense of another organism is a ________

• host.

• commensal.

• parasite.

• symbiont.

7. Undercooked pork is most likely to pass along ________

• Schistosoma.

• Taenia.

• Wuchereria.

• Trichinella.

 

8. Arthropods are responsible for transmitting _____ pathogens.

• viral

• bacterial

• protozoan

• viral, bacterial, and protozoan

9. 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.

10. 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.

11. 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

12. What special group of chemical substances are used to treat diseases by microbes?

• Antibiotics

• Synthetic drugs

• semi-synthetic drugs

• Antimicrobial agents

• Chemotherapeutic agents

13. 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

14. All of the following characteristics are components of nonspecific host defenses EXCEPT:

• Fever

• Mucus

• Antibodies

• Interferon

• Inflammation

15. 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

16. 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

17. 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

18. 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

19. The upper respiratory tract consists of the ________

1. pharynx.

1. asal cavity.

1. bronchi.

1. All of the above

1. Only A and B

20. 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

 

 

 

21. 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

22. 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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