Question

Organisms that grow evenly throughout a thioglycollate broth are called:

Facultative anaerobes

microaerophiles

autotolerant

obligate aerobes

Answer 1

##### Answer and Explanation #####

Here the option 3 i.e Aerotolerant anaerobes

• Explanation- Thioglycolate broth is a medium which is used to differentiate in the various types of microbes like obligate aerobes, obligate anaerobes, facultative anaerobes, microaerophiles, and aerotolerant organisms. This is the medium which allows the concentration of Oxygen in the different parts of tube and according to the need of oxygen the micro-organisms are distributed in the tube-

The organisms which do not require oxygen since they metabolize energy anaerobically but oxygen does not become poisonous for these organisms, hence they can be evenly distributed in the tube.

Further remaining options are irrelevant to the question because -

• Faculative anaerobes- Found at the top of the tube and can metabolize energy both way aerobically and anaerobically.
• Microaerophiles- Present at the upper part of the tube they can not ferment or respire anaerobically since they need oxygen.
• Obligate aerobes- These organisms are also present at the top of tube, they can not also ferment or respire anaerobically since they need oxygen.

Summary- in this way the option c i.e. Aerotolerant anaerobes are the organism which are evenly distributed in the test tube.

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