. 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 true of microorganisms?

They produce antibiotics.

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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


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 ________





7. Undercooked pork is most likely to pass along ________





8. Arthropods are responsible for transmitting _____ pathogens.




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?


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 sysnthesis

Inhibition of membrane permeability

Disruption of selective toxicity

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






15. What name is given to a substance that is recognized by the body as foreign and normally produces an immune response?






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?



E. coli


All of the above

17. Defense mechanisms in the urogenital system are numerous and include ________

normal flora compete 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 ________


nasal cavity.


All of the above

Only A and B

20. Group B Streptococcal disease include ________

early onset neonatal sepsis and meningitis.

late onset neonatal meningitis.

etiology is Streptococcus agalactiae.

All of the above

Only A and C



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