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.
A transcription unit is a linear sequence of DNA that extends from a transcription start site to a transcription stop site (Figure 4). Figure 4. The promoter, a DNA sequence that lies upstream of the RNA coding region, serves as an indicator of where and in which direction transcription should proceed.The promoter is not actually transcribed; its role is purely regulatory.he terminator, a sequence of nucleotides at the end of the transcription unit, is transcribed along with the RNA coding region. The terminator serves as a speed bump of sorts; transcription stops only after this region has been transcribed.