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Epigenetics describes heritable traits that are not linked to changes in DNA sequence, but to chemical reactions that regulate the transcription of the genes. A common event is methylation of lysine residues on histone proteins, which results in regulation of gene expression. Which reaction energy coordinate would be consistent for the mechanism for the exergonic SN2 reaction shown below?

What types of reactions for energy diagrams A and B represent?

Name the location where you would see these cave paintings.    This cave’s paintings were the first European cave paintings for which a prehistoric origin was suggested and promoted.

Which products are kinetically favored?

Name the location where you would see these cave paintings. This cave is significant for the variety and preservation of its paintings and engravings, dating back to the Paleolithic period.

Identify the culturally important site seen here. This culturally important site is renowned as the gem of Achaemenid (Persian) civilization in the fields of architecture, urban planning, construction technology, and art,  

For the following reaction, which solvent provides the fastest reaction rate?

What is the ∆G for a ratio of A and B at equilibrium?

For which of the following electrophiles below is an SN2 reaction with the nucleophile CH3CO2- expected to be the slowest?

Label the orbitals A and B in the SN2 reaction shown in the following figure.