The answer is an example of how bio augmentation has
improved an environment, is in the coke plant wastewater in China. The process
of adding cultured microorganisms into the subsurface for the purpose of
biodegrading precise soil and groundwater contaminants is called Bio
augmentation.
There are histones in the nucleus that DNA coils around. The part of the DNA that is coiled around the histones is not accessible, and cannot be expressed in that cell. DNA that is not wrapped around a histone can be transcribed.