Question

mlology of Gastrointestinal illness: Differentiation of Enterobacteriaceae 345 com a mixed ive and dif- PRE-LAB QUESTIONS Remember, Understand, Apply is 1. Resident enteric bacteria make it hard for pathogenic organisms to colonize the gut because the large resident population usually out-competes the pathogenic organisms for nutrients. a. true b. false 2. Facultative anaerobes are able to survive outside the large intestine. a. true b. false 3. The microbial population found in the large intestine , which makes the isolation of individual pathogens difficult. a. miniscule b. relatively small c. similar in size to the microbial population in the nose d. enormous 4. Which type of media allows only one type of bacteria to grow? a. selective media b. differential media 5. All members of the Enterobacteriaceae family are gram negative, oxidase positive, and ferment glucose to produce acid. a. true b. false 6. Define the following terms using the laboratory exercise or glossary Enteric om of centrai after tion of Kovac's -agent change on/Auburn

Answer 1

1. True.

2. True.

( A facultative anaerobe is an organism that makes ATP by aerobic respiration if oxygen is present, but is capable of switching to fermentation or anaerobic respiration if oxygen is absent. Due to the oxygen lacking characteristic of the large intestine, the organisms that thrive in this niche are anaerobes.)

3. enormous

4. selective media

( Selective media allow certain types of organisms to grow, and inhibit the growth of other organisms. Differential media are used to differentiate closely related organisms or groups of organisms.)

5. false

( Enterobacteriaceae is a family of Gram-negative, facultatively anaerobic, non-spore-forming rods. Characteristics of this family include being motile, catalase positive, and oxidase negative; reduction of nitrate to nitrite; and acid production from glucose fermentation.)

6.Entric-  Relating to the microorganisms living or present in the intestines.