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Which of the following is not a koch’s postulate ?
  • (A)  The bacteria should be able to be isolated from a diseased tissue
  • (B)  When inoculated in experimental animals bacteria may or may not cause disease
  • (C)  Pure cultures can be obtained
  • (D)  Bacteria should be able to be isolated from the diseased tissue in the experimental animals
By using phase contrast microscope_______________?
  • (A)  Internal structures are differentiated in living cells
  • (B)  Internal structures are differentiated in dead cells
  • (C)  Internal metabolic activities can be observed
  • (D)  External capsule formation can be observed