Explain how DNA methylation and histone acetylation affect chromatin structure and the regulation of transcription.

Explanation:

In histone acetylation, acetyl group (-COCH3) are attached to the lysines in the histone tails. When lysine are acetylated, their positive charges are neutral and the histone tails no longer binds to their neighboring nucleeosomes. Acetylation of Histones leads to activation of transcription because DNA is less tightly held to the nucleeosomes which makes DNA to easily bind to transcriptional machinery. But deaceylation leads to depression of transcription.

DNA methylation is the addition of an methyl group to the DNA bases, it inactive DNA. DNA methylation leads to long-term inactivation of genes could shutdown DNA transcription.

Thus, a dual mechanism, involving both DNA methylation and Histones deacetylation, can repress transcription.

answer: decrease

a limiting factor is the one which decrease the abundance, distribution and causes extinction of the population of species in a ecosystem. here, predators including hawks, owls and snakes are the limiting factor for the population of mexican free tailed bat.   although bats are nocturnal animals as they forge for food at night these predators also may remain active during night which can decrease the population of the mexican free-tailed bats. also, these bats eat only one type of insects that are moths. the food can also be a limiting factor as all 400 members are dependent upon same type of food needs that are moths. the decrease in the moth population can cause decrease in population size of the mexican free-tailed bats.

therefore, the scenarios will most likely to decrease the population size of the mexican free-tailed bats.