You are watching: Which of the following occurs when rna polymerase attaches to the promoter dna
The hereditary code is commonly referred to together a "blueprint" because it has the indict a cell requires in order come sustain itself. Us now recognize that over there is an ext to these instructions than merely the succession of letters in the nucleotide code, however. Because that example, large amounts of evidence demonstrate that this code is the basis because that the production of assorted molecules, consisting of RNA and also protein. Research study has also shown that the indict stored in ~ DNA space "read" in 2 steps: transcription and also translation. In transcription, a section of the double-stranded DNA template gives rise come a single-stranded RNA molecule. In some cases, the RNA molecule chin is a "finished product" that serves part important function within the cell. Often, however, warrior of one RNA molecule is followed by a translation step, which eventually results in the production of a protein molecule.
The process of transcription can be visualized by electron microscopy (Figure 1); in fact, it was very first observed making use of this method in 1970. In these early electron micrographs, the DNA molecules appear as "trunks," with countless RNA "branches" prolonging out native them. As soon as DNAse and RNAse (enzymes the degrade DNA and also RNA, respectively) were included to the molecules, the applications of DNAse got rid of the stems structures, while the use of RNAse wiped out the branches.
DNA is double-stranded, but only one strand serves together a theme for transcription at any type of given time. This design template strand is called the noncoding strand. The nontemplate strand is described as the coding strand because its sequence will certainly be the same as the of the new RNA molecule. In many organisms, the strand the DNA the serves together the design template for one gene may be the nontemplate strand for other genes in ~ the exact same chromosome.
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The process of transcription starts when an enzyme called RNA polymerase (RNA pol) attaches to the theme DNA strand and also begins to catalyze production of security RNA. Polymerases are huge enzymes composed of around a dozen subunits, and when active on DNA, castle are additionally typically complexed with other factors. In many cases, these determinants signal i m sorry gene is to be transcribed. 3 different species of RNA polymerase exist in eukaryotic bio cells, conversely, bacteria have actually only one. In eukaryotes, RNA pol i transcribes the gene that encode many of the ribosom RNAs (rRNAs), and also RNA pol III transcribes the genes for one small rRNA, add to the carry RNAs the play a vital role in the translate into process, and also other small regulatory RNA molecules. Thus, that is RNA pol II the transcribes the messenger RNAs, which offer as the templates for production of protein molecules.