Annotated Bibliography On Dna Replication

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.

3) As a ribosome moves along the mRNA, the genetic message is translated into a protein with a specific amino acid sequence.

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).

Sickle Cell Disease is an illness that affects people all across the globe. This paper will give a description of the sickness through the discussion of the causes, symptoms, and possible cures. Sickle Cell Disease (SCD) is a "group of inherited red blood cell disorders."(1) These disorders can have various afflictions, such as pain, damage and a low blood count--Sickle Cell Anemia.

Sickle Cell Disease is an autosomal recessive genetic disease that occurs due to a mutation in the β-globin gene of hemoglobin. Autosomal meaning that it is not linked to a sex chromosome, so either parent can pass on the gene to their child. This mutation is a result of a single substitution of amino acids, Glutamic for Valine at position 6 of a β globin chain. The presence of this mutation causes

Sickle cell anemia (SCA) is an autosomal recessive genetic disorder. This missense mutation is characterized by mutant beta globin subunits that tend to stick together (Cummings, 2014). As a result, abnormally shaped red blood cells are produced by this disorder. The erythrocytes are sickle or crescent shaped. Sickling occurs under hypoxic conditions, in which there is insufficient supply of oxygen delivered throughout the body (Sun & Xia, 2013). In order to inherit this monogenic disease, one copy of the sickle globin gene from each parent must be passed on to the offspring (Ashley-Koch,

The effects of the sickle cell mutation can be traced back to DNA in which the mutated gene is replicated and transcribed to mRNA. This mRNA is then used to synthesize polypeptides in the ribosomes where it translates the mutant genetic code (GUG) which codes for valine. Instead of the genetic code for glutamic acid (GAG) which is the amino acid found in the normal haemoglobin. This causes the haemoglobin to be clumped up together in the red blood cells and depriving them if oxygen causing a sickle shaped cell instead of the normal round, biconcave

Sickle Cell Anemia is caused by the gene that instructs the cell how to make hemoglobin. The gene that is defective, still instructs the cell and it causes the cells to take strange shapes. A genetic mutation occurred years ago in the people of the Mediterranean, India, Middle East, and Africa. The malaria epidemic attacked the people who lived in these countries and the people with the defective hemoglobin gene survived. When carrying only one defective gene, means a person has a sickle cell trait. Two parents with a trait, produce a child with the anemia.

Sickle-cell Anemia is a disorder that is typically inherited from a person's parents. Sickle-cell anemia results in an abnormality in the oxygen-carrying protein haemoglobin (haemoglobin S) that is found in red blood cells. In such a condition the red blood cells contort into a sickle shape. The affected cells die early which results to a shortage of healthy red blood cells and can block blood flow causing pain. The disease s caused by gene mutation through the process of substitution. In the Sickle-cell condition one Amino Acid; glutamic acid is always replaced by another acid valine. This happens in each of the two polypeptide chains of the haemoglobin molecule.This alteration results to a haemoglobin type S that is defective and is genetically

Sickle Cell Anemia (SCA) is a gene mutation that is autosomal recessive and it affects red blood cells. This means that an individual must inherit two copies of the mutated gene for sickle cell anemia to have the disease, one from each parent. To be a carrier, you must possess one copy of a normal gene and one sickle cell gene. This mutation is a substitution or point mutation, meaning one nucleotide is replaced with another. In sickle cell anemia, an adenine is replaced by a thymine. The goal of this investigation was to use gel electrophoresis and a UV light to observe sickle cell anemia. The guiding question was “Which individuals have sickle cell anemia?”. A mother, father, and child’s DNA was tested and compared to known DNA that was

Sickle Cell Disease is a genetic disease caused by a SNP (Single Nucleotide Polymorphism). Which means it is caused by a single letter gene mutation. Through the advent of CRISPR/Cas9 the disease might be cured. It is a serious reality and will enter medical trials within a handful of years. Sickle Cell Disease is an inherited disease that predominantly affects people of African descent. Red Blood cells become rigid and sickle shaped, causing blockages and pain crises. In cases of Sickle Cell Disease the Beta-Globin are mutated causing faulty and deformed Hemoglobin proteins thus creating sickled and short-lived Red Blood Cells.

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

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