Solution :
The Arg genes is used to synthesize the arginine. Arginine is chemical building block. It is very important and is used by our body to make the proteins for our body. When the Arg ID is abundant, the expression for the biosynthetic genes must turned off. And if the ArgR behaves as the gene repressor, then the binding of the arginine increases the infinity for the regulatory sites, and allows it to the bind and then shut off the expression of the genes.
If the ArgR acts as the gene activator, then the binding of the arginine would be predicted to reduce the affinity for the regulatory DNA, and preventing the binding and the shutting off the expression for the Arg genes.
around 55 percent of the world's population is thought to be living in an urban area or city, with that figure set to rise to 68 percent over the coming decades, according to the UN.
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The use of microorganism metabolism to remove pollutants such as oil spills in the water bodies id known as bioremediation.
Bioremediation is the branch of biotechnology which deals with the use of living organisms, like microorganism and bacteria, in the removal of pollutants, contaminants, and toxin from soil, water. It also used to clean up oil spills or contaminated ground water.
In this method, the microorganism grow or work under suitable condition, after the growth of microorganism, these microorganisms eats up toxic waste and digest them to release out gases like ethane and carbon dioxide.
Not all bacteria, fungi are useful in bioremediation method, only some microorganism are used to detoxify the pollutants. Example in oil spills pollutant the microorganism used is Pseudomonas putida.
To learn more about microorganism here
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The spreading of sound waves around openings in barriers is called a diffraction. A diffraction is the bending of waves around openings and also obstacles. The correct answer is C.