You are watching: Which of the following occurs when rna polymerase attaches to the promoter dna
The genetic code is frequently referred to together a "blueprint" because it has the accuse a cell needs in order to sustain itself. We now understand that over there is more to this instructions than just the sequence of letters in the nucleotide code, however. For example, vast amounts that evidence demonstrate that this code is the basis because that the production of various molecules, including RNA and also protein. Study has also shown the the indict stored within DNA room "read" in 2 steps: transcription and also translation. In transcription, a part of the double-stranded DNA template offers rise to a single-stranded RNA molecule. In some cases, the RNA molecule itself is a "finished product" the serves part important duty within the cell. Often, however, warrior of an RNA molecule is followed by a translate into step, which ultimately results in the production of a protein molecule.
The procedure of transcription have the right to be visualized by electron microscopy (Figure 1); in fact, that was an initial observed making use of this method in 1970. In these early on electron micrographs, the DNA molecules appear as "trunks," with numerous RNA "branches" extending out native them. Once DNAse and also RNAse (enzymes that degrade DNA and also RNA, respectively) were added to the molecules, the application of DNAse eliminated the trunk structures, when the usage of RNAse wiped out the branches.
DNA is double-stranded, however only one strand serves together a theme for warrior at any type of given time. This layout strand is dubbed the noncoding strand. The nontemplate strand is described as the coding strand due to the fact that its sequence will be the very same as the of the brand-new RNA molecule. In many organisms, the strand that DNA that serves together the design template for one gene may be the nontemplate strand for various other genes within the very same chromosome.
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The procedure of transcription begins when an enzyme referred to as RNA polymerase (RNA pol) attaches come the layout DNA strand and begins to catalyze production of security RNA. Polymerases are large enzymes created of roughly a dozen subunits, and when active on DNA, lock are also typically complexed with other factors. In countless cases, these components signal which gene is to it is in transcribed. Three different species of RNA polymerase exist in eukaryotic cells, conversely, bacteria have actually only one. In eukaryotes, RNA pol i transcribes the gene that encode most of the ribosom RNAs (rRNAs), and also RNA pol III transcribes the gene for one small rRNA, add to the move RNAs that play a an essential role in the translate in process, and other tiny regulatory RNA molecules. Thus, that is RNA pol II the transcribes the messenger RNAs, which serve as the templates for manufacturing of protein molecules.