Explain The Steps In The Dna Replication Process

Transcription is the formation of an RNA strand from a DNA template within the nucleus of a cell. There are four nucleotides of DNA. These are adenine, cytosine, guanine and thymine. These nucleotides are transcribed to form messenger ribonucleic acid (mRNA) consisting of nucleotides made of adenine, cytosine, guanine and uracil. This transcription from DNA to mRNA happens by an RNA polymerase II. This newly created mRNA is read in the 5' to 3' direction in sets of 3. These sets are called codons. Each mRNA also has a cap and end. On the 5 prime side is a methylated guanine triphosphate and on the 3 prime is a poly A tail. Messenger RNA then moves to the cells cytoplasm and through the cells ribosomes for translation. Messenger RNA is matched to molecules of transfer RNA (tRNA) in the ribosomes to create amino acids. These amino acids subsequently form an amino acid chain. (Osuri, 2003) A visual representation of this can been viewed in figure 3.

1) DNA programs protein production in the cytoplasm by transferring its coded information to a molecule called RNA (mRNA). The RNA then carries the order to build this type of protein from the nucleus to the cytoplasm.

Since DNA has the instructions for making protein we usually wonder how is it able to make ribosomes if DNA is stored within the nucleus. This is when a handy tool comes in called transcription and copies the DNA into mRNA so it can be reached outside of the cell.

Translation is a task that makes ribosomes synthesize proteins utilizing mRNA transcript made during transcription. In the begining of this task mRNA attaches it self to a ribosome so that it can be reveal a codon (three nucleotides).

Transcription is a process in which genetic information from DNA is encoded onto messenger RNA, by unwinding the DNA and splicing exons and introns and coding them onto the mRNA so the DNA itself is not used directly. Translation is a process by which ribosomes reads the mRNA to determine the amino acid sequence of the protein.

ends when the RNA polymerase reaches a triplet of bases then the DNA molecules re-

It provides a base triplet, a sequence of three bases on one of the strands of DNA, that code for one amino acid. The sequence of base triplets on DNA molecules determines the order of the amino acids on the protein chain. In the first phase of transcription, the first process of protein synthesis that occurs in the nucleolus, a portion of a DNA molecule unwinds and serves as a template. Free nucleotides floating in the nucleoplasm pair up with their complimentary bases on the DNA strand.

RNA interference takes advantage of an intermediate step between DNA and protein. DNA acts as a blueprint for the final protein by using messenger RNA (mRNA) . The mRNA is a messenger molecule between DNA and protein synthesis. There is a two steps process need to be completed in order to go from gene to protein. The first step in protein synthesis is transcription, it takes place in a cell’s nucleus, where the DNA template is used to make a single strand of mRNA. Then, the messenger RNA exits the nucleus and enters the cytoplasm. Now it serves as the template for making the protein. After that, with the help of several different molecules, a string of amino acids forms due to the order of the mRNA bases. This process is called translation

The virus replicates in the cytoplasm of the host cell. DNA replication and transcription may start immediately as the virus itself contains enzymes for replication and transcription. It does not rely on the host cell enzymes to begin replication (Koplow 2003). First, the DNA and RNA polymerase are made, along with other transcription

Polypeptides’ creation is a long process that involves your DNA. A polypeptide is basically a protein that is bonded between amino acids. DNA triplets also involve in the creation of polypeptides. Inside the DNA the mRNA enters inside and copies the code. Since the DNA can’t leave the nucleus the mRNA is the messenger for the DNA. Which is called transcription since the mRNA copies the sequences and order of the bases. Then the DNA strands split up into two strands and an enzyme will encase it to be copied or let it be paired up with other bases. As the enzyme is replacing itself with nitrogen bases the second strand is being transferred out of the nucleus. The strands that are being transferred out of the nucleus can be paired up with tRNA

DNA replication is described as semi-conservative. It is semi-conservative because the replication of one helix results in two daughter helices each of which contains one of the original parental helical strands. Furthermore, it is semi-conservative because the two new daughter DNA molecules are “half old” and “half new”; this means that half the original DNA molecule is saved, or conserved in the daughter DNA molecules.

Transcription is where DNA is transcribed into RNA which then can be pass to the ribosome’s to act as a template for protein synthesis. Before transcription can begin DNA must unwind and the two halves of the molecule much come apart so exposing the base sequence. This process begins when a region of a two DNA strands is unzipped by enzyme called RNA polymerase attaches to the DNA molecule at the imitation site.

The formation of a protein begins in the genes, which contain the basic building information for all parts of living organisms. There are four DNA nucleotides that make up genes: A, T, C, and G. A codon is any arrangement of three of these nucleotides. Each triplet of nucleotides codes for one amino acid. First transcription will begin in the nucleus where mRNA will transcribe the DNA template. During both transcription and translation, there are three steps. The first step in transcription is initiation where RNA polymerase separates a DNA strand and binds RNA nucleotides to the DNA. RNA nucleotides are the same as DNA ones except that U replaces the T. The second is just the elongation of the mRNA. The third step of transcription is termination. This occurs when RNA polymerase reads a codon region and the mRNA separates from the

material of some viruses. RNA molecules are like DNA. They have a long chain of

The process of DNA replication plays a crucial role in providing genetic continuity from one generation to the next. Knowledge of the structure of DNA began with the discovery of nucleic acids in 1869. In 1952, an accurate model of the DNA molecule was presented, thanks to the work of Rosalind Franklin, James Watson, and Francis Crick. To reproduce, a cell must copy and transmit its genetic information (DNA) to all of its progeny. To do so, DNA replicates following the process of semi-conservative replication. Two strands of DNA are obtained from one, having produced two daughter molecules that are identical to one another and to the parent molecule. This essay reviews the three stages