5. Most bacteria that you find on your body are A) acidophilic thermophiles B) m

Question

5. Most bacteria that you find on your body are A) acidophilic thermophiles B) mesophilic neutrophiles C aerobic psychrophiles D) capnophilic hyperthermophiles Q alkalinophilic halophiles 6. The phase of the bacterial growth curve where the metabolic rate of organisms dedine and the number of dying oells equals the number of oells produoed is the A) Lag phase B) Log phase C Stationary phase D) Death phase E Exponential phase 7. A bacterial sample was inoculated into thioglycollate broth. After 20 hours of incubation, it was noted that there was growth only on the very top surface of the broth. From the above observation, you condude that the organisms are A) Obligate Aerobes B) Obligate Anaerobes C Facultative anaerobes D) Aerotolerant anaerobes E None of the above are toxins that are the lipopolysaccharide of the outer membrane of Gram-negative A) Exotoxins B) Endotoxins C Enterotoxins D) Leukocidins Hemolysins

Explanation / Answer

5. Answer is option B. Mesophilic neutrophiles

Mesophilic bacteria are the ones which prefer temperature range of 20 to 45 degree C. Since the skin, saliva and large intestine have almost neutral pH, these neutral ph loving bacteria thrive at these places.

6. Answer is option C. Stationary phase.

In the stationary phase the bacteria fight for nutrition and slow down their metabolic rate.

7. Answer is option A. Obligate aerobes.

Strict aerobes tend to grow in surface of liquid media as a pellicle as oxygen is abundant.

8. Answer is option B. Endotoxin

The lipopolysaccharide of gram negative bacteria itself acts as endotoxin. It is less potent than exotoxin.

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