The iron curtain divides the line between the Western and Eastern part of Europe. In the Eastern part of Europe under the rule of the Soviet Union, Communism was the type of g â¦ overnment practiced.e was talking about the spread of communism in Eastern Europe and said that 'from â¦ Stettin on the Baltic to Trieste on the Adriatic, an Iron Curtain has descended over Europe'. He meant that Europe was now split into two zones-East and West.
Promoter sequences are DNA sequences that define where transcription of a gene by RNA polymerase begins. Promoter sequences are typically located directly upstream or at the 5' end of the transcription initiation site.
Chromatin structure and function: a guide. Related. Chromatin is comprised of histones and DNA: 147 base pairs of DNA wraps around the 8 core histones to form the basic chromatin unit, the nucleosome. The function of chromatin is to efficiently package DNA into a small volume to fit into the nucleus of a cell and protect the DNA structure and sequence. Packaging DNA into chromatin allows for mitosis and meiosis, prevents chromosome breakage and controls gene expression and DNA replication.