PAPER Topics

... suggested that the active site is flexible. The binding between and substrate appears to alter the shape of the enzyme. This induces a close fit between the active site and the substrate. It is also believed that this may put some strain on the substrate molecule facilitating the reaction. Another characteristics of are competitive inhibition and non-competitive inhibition. Competitive inhibition is the binding of a competitive molecule to the active site of the enzyme. This prevents the proper substrate from reacting with the enzyme. In non-competitive inhibition the binding of a non-competitive inhibitor to another site on the enzyme induces an allosteric change, or conformational ...

... selection operating upon random variation gave rise rise to all animals and plants. While the source of variation is random, the direction of evolution is not. In effect, natural selection removes chance, and it makes the theory of evolution plausible. If neo-Darwinism is correct then numerous small successive changes guided by natural selection gave rise to all animals and plants. I will prove that natural selection is not a creative process. Its primary function is to preserve the status quo. Thus, new structures and organs must arise through chance. Natural selection can only preserve and optimize these new structures and organs after they evolve through chance. I ...

... one of the pioneers of computer science, had begun to explore the nature of very basic a-life formats called cellular automata (see AUTOMATA, THEORY OF) in the 1950s. Cellular automata are imaginary mathematical "cells" --analogous to checkerboard squares--that can be made to simulate physical processes by subjecting them to certain simple rules called algorithms (see ALGORITHM). Before his death, von Neumann had developed a set of algorithms by which a cellular automaton--a box shape with a very long tail--could "reproduce" itself. Another important predecessor of a-life research was Dutch biologist Aristid Lindenmeyer. Interested in the mathematics of plant growth, Lindenmeyer fo ...

... around the world). A recent tree-ring study indicated that this is the warmest decade in six hundred years (Allen & Herreid, 82). Undeniably, the weather is getting warmer. According to an article in The Economist, a conservative newsmagazine, "The sea is warming, the plankton dying; floods are sweeping the land. In California, the climate is acting in a peculiar way. So, too, in Antarctica, where unlooked-for flowers are blooming as the ice shelves disintegrate…In Southern Africa, it looks as though the rains will fail. Again. All over the world, there is something odd about the weather" ("Feuding over Global Warming", 6). There may be nothing out of the ordinary about th ...

... hinted he may be repeating his experiment to silence the critics (Recer). Wilmut does not have the courage to repeat his experiment, also that the government will never allow him to repeate it. Another reason for cloning is that before it was done and even now scientists think cloning could help produce genetic models of human diseases. With this researchers could understand them and develop cures . Also cloning could bring new insights into the process of aging ("Mammalian"). The reason they want to do this is because if scientists could understand aging then maybe they could extend or eliminate it. One other reason cloning was started, other than scientists wanting to change the world, w ...

... it will need a little help. These two cells are then electrified thereby causing the two cells to fuse together combining their genetic structures. Cloning / 3 Now that we have established the scientific basis of cloning, let me tell you how cloning can directly benefit humanity. There are many health issues that can be avoided, reversed and cured by the cloning of human cells and body parts. With the aid of cloning technology, couples that have suffered infertility would be able to have their own biological children. Cloning technology may potentially be used to completely reverse the effects of heart attacks. It is a distinct possibility that scientists will ...

... Scientists believe that eukaryotic organisms such as the protists evolved from the prokaryotes. There are two main theories which describe how this transition may have occurred. The first is the endosymbiotic theory, or enosymbiosis, and the other is the autogenous theory, or autogenisis. These two theories are not mutually exclusive, meaning one or the other could account for different parts of eukaryotic cells. The endosymbiotic theory states that the formation of eukaryotic cells were symbiotic associations of prokaryotic cells living inside larger prokaryotes. The endosymbiotic hypothesis accounts for the presence in eukaryotic cells of complex organelles not found in ...

... aren’t equipped with the technology that is needed to keep the baby alive and the baby has to be transported to a bigger hospital, usually to a hospital in a metropolitan city in order to get the proper care. After the baby has been assessed for problems then it is watched closely for the next 48 hours. This is the most critical time for a baby . During this time the doctors can determine if the baby is going to have a long road ahead of them or if the baby is healthy and will pull through the whole thing with flying colors. Sometimes, they may seem healthy and are progressing well and then they could have a turn for the worse without any warning signs at all. For a parent, this can be ...

... was no beginning in the past, nor will there be change in the future. This model assumes the perfect cosmological principle. This principle says that the universe is the same everywhere on the large scale, at all times.2 It maintains the same average density of matter forever. There are observational evidences found that can prove the Big Bang model is more reasonable than the Steady State model. First, the redshifts of distant galaxies. Redshift is a Doppler effect which states that if a galaxy is moving away, the spectral line of that galaxy observed will have a shift to the red end. The faster the galaxy moves, the more shift it has. If the galaxy is moving closer, the spect ...

... fusion reasearch still needs a lot of time, there has been some progress in discovering how we can use this. The two fusion reactions that are the most promising both involve the heavier isotopes of hydrogen: 1) deuterium (composed of one proton and one neutron) Deuterium occurs naturally as a minor constituent in all hydrogen-containing materials--such as water--in quantities sufficient to meet all the energy needs of societies for many billions of years. 2) tritium (composed of one proton and two neutrons). Tritium can be bred from lithium by a neutron-induced reaction in a blanket that could conceivably surround a fusion reactor. The western United States contains large lithium d ...