Question

Microbiology

1. Presence of capsules, and toxins make an organism more virulent
          A. True
      B. False

2. Which is a communicable and contagious infection?
       A. Common cold
       B. STD
       C. hepatitis B
       D. HSV 2 Infection

3. Match the step in the postulate with the explanation that shows why the step cannot be accomplished in all situations.
            1. Kotch's postulate: Microorganism must be present in every case of the disease
            2. Koch's postulate: Suspected microorganism must be grown in the laboratory
            3.Koch' s postulate: Suspected microorganism must be cultured in the laboratory. Inoculation of laboratory   gorwn organism into a susceptible host must cause the disease in the host.
            4. Koch's postulate: Disease must be present every time the organism is inoculated into the host
     
          A. Some microorganisms grown only in humans, it would be unethical to inoculate a human host.
      B. One of the following organisms could be isolated from cases of meningitis: Streptotoccus pneumoniae, Neisseriae meningitis, or Haemophilus influenza.
      C. Some hosts carry the organism, but do not present signs or symptoms of the disease
          D. Mycobacterium leprosi, and Trepnema pallidum are two organisms that cannot be grown in the laboratory.


4. DIsease causing organisms have virulence determinants that can be used to overcome the host's immune system
       A. True
       B. False
   

Answer 1

1. Presence of capsules, and toxins make an organism more virulent
         A. True
      B. False

2. Which is a communicable and contagious infection?
       A. Common cold
       B. STD
       C. hepatitis B
       D. HSV 2 Infection

3. Match the step in the postulate with the explanation that shows why the step cannot be accomplished in all situations.
            1. Kotch's postulate: Microorganism must be present in every case of the disease
            2. Koch's postulate: Suspected microorganism must be grown in the laboratory
            3.Koch' s postulate: Suspected microorganism must be cultured in the laboratory. Inoculation of laboratory   gorwn organism into a susceptible host must cause the disease in the host.
            4. Koch's postulate: Disease must be present every time the organism is inoculated into the host
     
3. Some microorganisms grown only in humans, it would be unethical to inoculate a human host.
1. One of the following organisms could be isolated from cases of meningitis: Streptotoccus pneumoniae, Neisseriae meningitis, or Haemophilus influenza.
4. Some hosts carry the organism, but do not present signs or symptoms of the disease
2. Mycobacterium leprosi, and Trepnema pallidum are two organisms that cannot be grown in the laboratory.


4. DIsease causing organisms have virulence determinants that can be used to overcome the host's immune system
      A. True
       B. False