Question

A sample brought by a sampling robot from the bottom of the ocean is prepared into two microcosms. One anaerobic and another aerobic both media contain glucose as the electron donnor. Which of the following is an expected outcome from this experiment

a. Anaerobic microbes don’t survive in cold environments. The anaerobic microcosm is unsuitable for microbial growth

b. Anaerobic microbes have a faster generation time then aerobic ones

c. Both microcosms have similar chances to show microbial growth after incubation under the appropiate temperature and pressure

d. There is no way microbes can survive at laboratory conditions

123. A new microbe has been identified as a cause of a new epidemic. Which of the following determine the biosafety measures to deal with the microbe?

     a. Pathogenicity b. Morbidity. c. Mode of transmission and host range d. Presence of cell membrane e. Availability of effective treatment

124. Symbiotic organisms would be best grown on which type of media? a. synthetic c. minimal
     b. selective d. enriched

Answer 1

Answer 1:

The sample is bought from the bottom of ocean. In such an environment, there is no oxygen, and the thriving microbes are generally anaerobic.

But, when they are bought into lab conditions, with an aerobic and an aerobic media, then both microsoms would have similar chances of growth. The microsoms on anaerobic media will naturally grow, whereas the microsoms on aerobic media can grow via aerobic or anaerobic pathway of glucose utilization. This would be possible due to the presence of facultative anaerobic microbes in the sample. These microbes can switch to aerobic pathway when oxygen is made available.

The anaerobic microbes may undergo mutation and selection to become efficient in aerobic conditions, as it can provide more energy and a higher growth rate.

Hence, the correct choice should be:

(c) Both microcosms have similar chances to show microbial growth after incubation under the appropiate temperature and pressure.

Answer 2:

Biosafety steps can be taken once we know how a pathogen is spreading and which organisms are the potential host. Thus, the correct choice should be:

c. Mode of transmission and host range.

Answer 3:

Symbiotic organisms are those interacting organisms which arw dependent on each other for survival. To check for this relationship, we can allow different groups to grow in minimal medium. The product of one group of organisms would help in the survival of the other group of organisms. Thus, the correct choice should be:

(C) minimal

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