Variation in the composition of DNA and RNA has already been pointed out. Also, usually, RNA was found as a double helix, but it is not a single circuit. However, in order to form parts with a double-stranded structure having a three-dimensional structure of the protein, the polynucleotide chain may fold back on itself.
Transcription of the RNA strand is shown in the left graph. One major difference is, instead of the DNA code for the uptake of uracil thymine its heterocyclic amines, adenine and RNA in DNA. That thymine is not found in RNA, I will remember not to be confused the exchange of uracil in RNA for thymine in DNA during transfer. For example, the code still of adenine and uracil DNA code of adenine RNA uracil for thymine in RNA to DNA. Uracil (red) is located at the new DNA RNA, with the exception of the thymine, please be noted that it is the same as the non-coding DNA. There are three main types of RNA, which is described later. It is synthesized in the core RNA, but cytoplasmic used for protein synthesis, it passes out of the nucleus.
By to relax DNA, placing the mRNA molecular basis has grown, the process to build a chain of mRNA, associated with the RNA polymerase, adding a template strand of DNA. in the form of mRNA, and is used instead of thymine as a uracil base complementarity adenine. The other of the DNA strand complementary to the template base strand mRNA having the same sequence as the base of the upper strand (U is substituted for T) of the DNA of the called coding strand. According to Karp, RNA polymerase will be able to add nucleotides 20-50 of the second growing chain mRNA. I have shown that the image of the electron microscope exists RNA polymerases operation hundred or more simultaneously.
Coding region of DNA for specific proteins (genes), contains a model of the protein. Preceded by promoting regions coding regions, and are associated with increased DNA region of the transcription factor. This has raised the RNA polymerase required to activate the copy model of the coding region of the RNA. Segments of the transfer DNA, contains (5 ‘), some material that is not translated as (3) the end of the segment to the upper RNA. Further, segments, and has a segment called intron untranslated exon called that is part of a pattern for protein in general. Start, chain elongation, and termination: is done in three steps in RNA transcription process.
The RNA polymerase promoter complex, the first step when it binds to the promoter of the gene in the DNA occurs. This also, I allow the establishment of the first sequence of the RNA polymerase. As long as it is present (shown in blue in the chart), sigma protein does not function enzyme promoter. Specific sequences of non-coding strand of DNA is recognized as a signal to initiate the development process.
that (in contrast to the desire of the DNA to form a complementary strand of the double stranded) mRNA live in the state of one strand is happy. In prokaryotes, all nucleotides of the codon in the mRNA is a part of the new protein. However, in eukaryotes, has a sequence complementary to the RNA or DNA that does not encode a protein called introns. does not exceed (mRNA is) is to go to the construction site working copy of the plan where the workers build a new protein. Prokaryotes, for example cell, if E. coli F., is a bacterium as the quality of the site then. Cells are eukaryotic organisms such as human cells, mRNA is leaving the core of the big hole in the nuclear membrane (nuclear pore), enters the endoplasmic reticulum (ER) then. If
Diploid cell each nucleated of the body contains the genomic DNA or the same, but it looks to a variety of cells that are related to specific tasks vary, for example, pancreas sodium and kidney cells to produce insulin I absorb the cells. How is this possible? In the differential use of genome answers, in other words, different cells of the body, representing different portions of the DNA. Begins with transcription into RNA from DNA, this process leads to changes in cell function ultimately. Thus, the means for regulating cell function across species variations of the transfer per se. In response to the signal in the environment, in fact, organisms such as single cell bacteria, regulation of gene transcription further. So it’s important to understand how to regulate transcription is essential to decipher the secret of the genome.
This is a complex of proteins known as RNA polymerase is essential for the process of transcription. RNA polymerase is found in all species, but I have changed to different taxonomic groups of composition and size of these proteins. Including, for example, three different types of (multi-cellular organisms and yeast) eukaryotic organisms, bacteria, including the RNA polymerase of one kind. In spite of these differences, there are similarities between the transcription machinery. For example, it requires a transfer mechanism that can be adjusted to achieve a change in spatial and temporal expression of the gene in all. In order to understand what this means completely, you will need first to study the mechanism of RNA transcription in detail.