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Compose a 1750 words essay on Exam papers. Needs to be plagiarism free!PCBs are organohalogens prepared by having chlorine react with biphenyl, an aromatic hydrocarbon used as a heat-transfer fluid. T

Compose a 1750 words essay on Exam papers. Needs to be plagiarism free!

PCBs are organohalogens prepared by having chlorine react with biphenyl, an aromatic hydrocarbon used as a heat-transfer fluid. These compounds are found to have high resistance toward decomposition and due to low levels of environmental degradation, PCBs proceed to dwell in bodies of water, soil, and in an organism’s fatty tissue. They are biologically toxic to aquatic creatures, both vertebrates and invertebrates. As a grave hazard to human health, PCBs may lead to dysfunction of liver, carcinogenic effect, dizziness, and dermatitis.

Several factors may affect the soil’s interaction with exogenous organic compounds including soil aggregation by waste products of bacteria. Besides aggregate stability, the interactive potential or resilience of soil to exogenous organic matters may be determined further by factors as land technology used, farming system, and agricultural management employed.

In the field of biotechnology, this can be demonstrated in terms of the water’s reaction to break polymeric bonds such as the ester links that are often present between two amino acids in a protein. After such bonds have been broken, a hydroxyl group (-OH) in water is yielded to one of the products while carboxylic acid becomes of the other upon acquisition of H+. Moreover, the environmental degradation of endogenous substances may be hydrolytically carried out with the aid of catalyzing enzymes in the process of decomposing other polymers like nucleotides, complex sugars, starch, and even fats.

Atrazine --- derived from the synthesis reaction involving cyanuric chloride, the chief precursor to the toxicity of atrazine, and isopropyl amine. this reaction is performed in xylene or toluene in the presence of water and addition of NaOH.

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