Question

Your friends performs metagenomics on an environmental sample. This experiment demonstrates the presence of the following...

Your friends performs metagenomics on an environmental sample. This experiment demonstrates the presence of the following microbes: Citromicrobium, Pelagibacter, Nitrosopumilus, Prochlorococcus, and Trichodesmium. From which location was this sample most likely taken?

•   O horizon
•   Open ocean
•   Rhizosphere
•   Biofilm
•   Deep sea
•   Freshwater

Science   Biology   
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Answer #1

The sample was taken from the Open Ocean

It is because the bacteria are mostly marine, aerobic, photosynthetic. All these conditions can be met only when the are present on the surface in open ocean.

Other options are incorrect as :

O horizon is the horizon of soil profile but not of sea or ocean.

Rhizosphere , although Trichodesmium is nitrogen fixing cyanobacteria it is aerobic, and occurs in ocean.

Biofilm,  These microorganism are nog part of biofilms.

Deep Sea,  since some of these microganisms are phototrohic they cannot survive in deep sea.

Fresh Water,  These microorganisms are not fresh water but marine.

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