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Chapter 12 the structure of dna
Chapter 12 the structure of dna
The structure of dna
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Recommended: Chapter 12 the structure of dna
DNA is the foundation of all genetic material found in every living organism on earth. Commonly known as its full name Deoxyribonucleic acid it is an electrically neutral group of atoms held together in a chemical bond known as a molecule. In this case a biomolecule produced by a living organism composed of nucleic acid, carbohydrates and proteins. This mixture coiling in two biopolymer strands forming a double helix. Biopolymers being a biomolecule of a polymer, which is a large molecule, composed of monomers (a molecule that binds chemically to other molecules). These biopolymer strands are composed of thirteen nucleotide monomers bonded in a chain, in turn called a polynucleotide. Nucleotides being singular polynucleotides composed of a nucleobase (containing nitrogen). Being split into four bases each nucleobase is as followed:
• Guanine: Pairing in sequence with cytosine, guanine is derived from purine. Purine is an organic compound structured from a pyrimidine ring fused to an imidazole ring (called a pyrimidine-imidazole ring). The base is represented as ‘G’.
• Adenine: Similar to that of Guanine, Adenine is derived from purine. In addition it’s an important part of adenosine triphosphate (ATP). ATP is the nitrogenous base adenine bonded to a five carbon sugar. This molecule has the ability to phosphorylise and add phosphate groups to other molecules. This allocation of phosphates allows energy to be released. It is this energy which is used in the cells of living organisms.
• Thymine: Combining with Adenine this nucleobase is often replaces with uracil in RNA. It is also the common cause of mutations in DNA. When in the presence of ultraviolet light, radiation causes alterations in the DNA molecule that inhibit normal...
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... in corn, soybeans and cereal grains are found in the indigestible compound phytate that passes through the digestive tract of the pig and is enriched in the manure. The carbohydrates and proteins in this food are digested and absorbed. When manure from ordinary pigs is spread throughout land in areas surrounding intense swine production, it has been shown that there is an accumulation of phosphorus in the soil. Upon heavy rain this phosphorus rich soil runs into water ways in turn increasing the phosphorus concentration of the water. Algae grows layering the body of water causing the reduction in oxygen concentration in the liquid which results in the death of fish and other aquatic animals. The ecosystem of the area is effect, removing food for birdlife and killing plant life. Frequently toxins are produced by the algae and the water is no longer safe to drink.
of damage in the form of pollution; but rather than let this abundant resource go to waste, why not just fix it? Enviropig—a genetically modified hog programmed to have reduced levels of phosphorus in its feces— could be one of the first steps toward fertilizer that won’t have as large of an impact on our planet, while keeping our crops growing and our store shelves stocked. I believe that this transgenic animal provides our farmers with the best of both worlds: reducing their environmental footprint and maintaining economic stability; although its production is controversial, the moral obligation to do our best to keep our planet fit for future generations
Introduction DNA is the molecule that is responsible for the storing and replicating of genetic material for an organism. The genetic material is the thing that gives an organism its identity. DNA is in the shape of a double helix. It consists of a phosphate group, deoxyribose, and a nitrogenous base. The phosphate groups are synthesised together to create an ester.
Let's break down what DNA really is. DNA stands for Deoxy-ribo Nucleic Acid. Deoxy means that there is a missing oxygen atom in the sugar on the second carbon in DNA. It is the only chemical difference between the sugar molecule Deoxy-ribose and the regular sugar ribose. Ribo means that there is a sugar. Now, what does the word Nucleic mean? The word comes from a German word Nuklein, meaning comes from the nucleus. Therefore, DNA is an acid that has sugar, but has no oxygen. DNA is made of nucleotides, but what does that really mean? There are only 4 types of nitrogenous bases in DNA: adenine, thymine, cytosine, and guanine. All 4 of these are nucleic acids. These bond together with a Hydrogen bond. Adenine bonds with thymine, and cytosine bonds with guanine. The “backbone” of the DNA is the phosphate group and the ribo group bonded by covalent bonds. What is the difference between RNA and DNA? Well, as discussed before, there is one oxygen atom missing from the sugar in DNA, but there are more di...
Theoretical models for the molecular structure of DNA can be likened to scientific theories. DNA’s structure was determined largely because scientists scrutinized the relationship between theory (a particular theoretical model of DNA) and observation (x-ray crystallographic patterns, or bonding patterns between bases and sugar-phosphate groups, for example). Inductivists, falsificationists, Kuhn, and Feyerabend all have different accounts of how scientists have related theory to observation. These accounts are important because, not only do they delineate frameworks scientists use to develop their theories, but because these frameworks subsequently became important in developing a theory for the molecular structure of DNA.
Phasing out animal agriculture and replacing it with stronger, safer plant cultivation would greatly reduce pollution released into the environment as animal waste, burning fossil fuels, and contaminated water runoff. The animal waste produced in factory farms is dumped into immense open-air lago...
Most major discoveries have exciting stories to accompany them and account for said discovery. The discovery of DNA’s double helix by James Watson and Francis Crick is no exception.
DNA (deoxyribonucleic acid) is a self-replicating molecule or material present in nearly all living organisms as the main constituent in chromosomes. It encodes the genetic instructions used in the development and functioning of all known living organisms and many viruses. Simply put, DNA contains the instructions needed for an organism to develop, survive and reproduce. The discovery and use of DNA has seen many changes and made great progress over many years. James Watson was a pioneer molecular biologist who is credited, along with Francis Crick and Maurice Wilkins, with discovering the double helix structure of the DNA molecule. The three won the Nobel Prize in Medicine in 1962 for their work (Bagley, 2013). Scientist use the term “double helix” to describe DNA’s winding, two-stranded chemical structure. This shape looks much like a twisted ladder and gives the DNA the power to pass along biological instructions with great precision.
DNA replicates by a semi-conservative method. New strands are strands of complementary RNA that is antiparallel to the DNA strand. They do this by pairing up by means of hydrogen bonding.In RNA thymine, is replaced by uracil. In the mRNA sequence, the nucleotide sequence is read as an instructional guide for protein synthesis. Three bases make a codon, which codes for an amino acid. In bacterial transcription the mRNA lacks introns. However in eukaryotic transcription, the mRNA contains introns and moves out of the nucleus so that it can be translated. The basic molecular process is RNA polymerase recognizes the promoter, the RNA polymerase begins to synthesize nucleic acid in a 5'-3' direction, but it reads it from a 3'-5.' The process of transcription in bacteria and eukaryotes is slightly different. In bacteria, transcription produces an mRNA, however in eukaryotes transcription produces a pre-mRNA which then goes for further RNA processing to become an
ATP is often referred to as the energy currency of life. The body’s cells use a special form of energy called adenosine triphosphate to power almost all their activities, such as muscle contraction, protein construction, and transportation of substrates, communication with other cells, activating heat control mechanisms, and dismantling damaged and unused structures.
DNA is a molecule that has a repeating chain of identical five-carbon sugars (polymers) linked together from head to tail. It is composed of four ring shaped organic bases (nucleotides) which are Adenine (A), Guanine (G), Cytosine (C) and Thymine (T). It has a double helix shape and contains the sugar component deoxyribose.
The unprecedented and environmentally friendly Enviropigs from the University of Guelph is beneficial to society due to its modified genes that allow them to produce 30 to 65 percent less phosphorus in their manure, thus reducing the amount of major pollution in the ocean. In addition, Enviropigs better improve the lives of farmers who cannot afford to purchase pig feed with pure phosphorus and also increase the field of consuming transgenic food. The Enviropig, a transgenic Yorkshire pig, was initiated by Dr. Cecil Forsberg, a professor at the University of Guelph, who believed that Enviropigs could improve food production. “When transgenic food animals are accepted by consumers, the Enviropig perhaps would be one of the first innovations to be introduced into swine production,” said Dr Forsberg. “We have demonstrated that the gene can be transferred by breeding through many generations in a stable fashion. Furthermore, the pigs are healthy.” These Enviropigs have altered salivary glands which permits them to consume the phosphorus in feed stuff and reduce the amount of phosphorus they exhaust to prevent destroying the algae in oceans, consequently creating ‘dead zones’.
Moses, R. E., & Summers, W. C. (Eds.). (1988). DNA replication and mutagenesis. Washington, DC, WA: American Society for Microbiology.
The production process of meat requires huge amount of pesticides, fuel, feeds and fertilizers, which leads to the release of greenhouse gases, manure and a lot of toxic chemicals to our air and water. According to the U.S. Environmental Protection Agency (EPA), animals on U.S. factory farms produce about 500 million tons of manure each year. Because there is no animal sewage processing plants, it is most frequently stored in massive open-air waste lagoons and are prone to leaks. Runoff from factory farms is one of the leading causes of pollution in our rivers and lakes. The EPA notes that bacteria and viruses can be carried by the runoff and that leads to contamination of
DNA is the hereditary material in humans and almost all other organisms. It's full name is deoxyribonucleic acid. It consists of nitrogenous bases, which include ...
Manure may not be a luxury topic, but it is currently a hot topic for the agriculture industry. Presently, there are about 20 million pigs being raised in Iowa alone, and Iowa’s lush cropland greatly benefits from the manure output. Manure provides the soil with nutrients such as nitrogen, phosphorus, and potassium; improves suitability for planting; increases water holding capacity; reduces erosion; and supplies an energy source for microbial activity (Murphy, 1996). Although the soil quality is improved, there are some concerns about manure. The main issues involve air and water quality, such as odor and runoff (Hatfield et al., 1998).