Molecular biologists can determine experimentally whether a region of dna contains closed chromatin or open chromatin by assessing the sensitivity of the region to molecular biologists can determine experimentally whether a region of dna contains closed chromatin or open chromatin by assessing the sensitivity of the region to nucleosomes. b. rna polymerase ii. c. methyltransferase. dnase. d. histone deacetylase.

c) methyltransferase. DNAse.

Explanation:

The way DNA is folded can affect gene expression, or which genes are turned on. When the chromosomes are tightly condensed, the DNA is wrapped very tightly which makes it difficult for transcription factors to bind to the DNA.

good one: produce hormones that plants grow.

bad one: the problem with organic matter is that while plant nutrients are needed for crop growth, they can also stimulate excessive growth of the wrong plants – mainly, algae.

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.