SCI250 Week 7 Final Examination – 4 points each.  Please highlight, check and or underline the most appropriate response for each question.

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

• pink, clear.
• pink, purple.
• purple, pink.
• purple, blue.

4.     Classification is necessary to _________

• establish criteria for identifying organisms.
• arrange related organisms into groups.
• provide information about how organisms evolved.
• All of the above

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

• host.
• commensal.
• parasite.
• symbiont.

6.     Undercooked pork is most likely to pass along ________

• Schistosoma.
• Tania.
• Wuchereria.
• Trichinella.

7.     Arthropods are responsible for transmitting _____ pathogens.

• viral
• bacterial
• protozoan
• viral, bacterial, and protozoan

8.     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.

9.     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.

10.  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

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

• Antibiotics
• Synthetic drugs
• Semi-synthetic drugs
• Antimicrobial agents
• Chemotherapeutic agents

12.  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

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

• Fever
• Mucus
• Antibodies
• Interferon
• Inflammation

14.  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

15.  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
• Deodex
• All of the above

16.  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

17.  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

18.  The upper respiratory tract consists of the ________

• pharynx.
• nasal cavity.
• bronchi.
• All of the above

19.  Group B Streptococcal disease include ________

• early onset neonatal sepsis and meningitis.
• late onset neonatal menegitis.
• etiology is Streptococcus agakactiae.
• All of the above

20.  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
• Haemophilus influenzae
• Streptococcus pneumoniae
• Listeria monocytogenes

21.  Food contamination occurs as a result of ________

• unsanitary practices by food handlers.
• improper storage.
• importation.
• All of the above