BIOLOGY
BIOLOGY
5th Edition
ISBN: 9781265202859
Author: BROOKER
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Chapter 27, Problem 4TY

 Place the following steps in the correct order, according to Koch’s postulates:

I.    Determine if pure cultures of bacteria cause disease symptoms when introduced to a healthy host.

II.    Determine if disease symptoms correlate with presence of a suspected pathogen.

III.    Isolate the suspected pathogen and grow it in pure culture, free of other possible pathogens.

 IV.    Attempt to isolate pathogen from second-infected hosts.

  1. a. II, III, IV, I
  2. b. II, IV, III, I
  3. c. Ill, II, I, IV
  4. d. II, III, I, IV
  5. e. I, II, III, IV
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the following are the steps, listed in random order, for utilizing koch's postulates. what should be the second step out of the four listed? a. a microorganism is found to be present in every case of a disease. b. the same microbe discovered previously is isolated from the purposely infected host c. the pathogen is isolated and grown in pure culture d. the same disease results after isolated organism is inoculated into healthy host
The following are the limitations of Koch's postulates EXCEPT: A. some pathogens cannot grow on artificial media and therefore cannot be identified as the causative agent of the disease B. some diseases involve multiple pathogens which produce similar symptoms making it difficult to pinpoint the causative agent C. some diseases are host-specific and re-inoculation may pose ethical concerns D. some microorganisms are present in the body fluids of the infected animal which make them difficult to be cultured
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