Microbiology

1. Presence of capsules, and toxins make an organism morevirulent
          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 thatshows why the step cannot be accomplished in all situations.
           1. Kotch's postulate: Microorganism must be present in every caseof the disease
           2. Koch's postulate: Suspected microorganism must be grown in thelaboratory
           3.Koch' s postulate: Suspected microorganism must be cultured inthe laboratory. Inoculation of laboratory   gorwnorganism into a susceptible host must cause the disease in thehost.
           4. Koch's postulate: Disease must be present every time theorganism is inoculated into the host
     
          A. Somemicroorganisms grown only in humans, it would be unethical toinoculate a human host.
      B. One of the following organisms couldbe 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 twoorganisms that cannot be grown in the laboratory.


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