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(D) : Bioremediation is the process of using living microorganisms to clean up a contaminated site. Microorganisms perform this by removing toxins fro

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Pseudomonas

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(D) : Bioremediation is the process of using living microorganisms to clean up a contaminated site. Microorganisms perform this by removing toxins from materials. They decompose these compounds by using enzymes,which are specific proteins that control reactions in living cells. Organisms that produce enzymes capable of degrading petroleum are useful in cleaning up oil spills. Some common examples that break down oil are genetically engineered species of $Pseudomonas$ and $Azotobacter$. Bioremediation accounts for $5$ to $10$ percent of all pollution treatment and has been used successfully in cleaning up leaking underground gasoline storage tanks. Bioremediation has many applications,from the ordinary garden compost to the removal of selenium and other toxic metals from waste. The best agents for bioremediation are those that can break down contaminants without becoming contaminated or harmful themselves.

$A$ genetically engineered microorganism used successfully in bioremediation of oil spills is a species of

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