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One gene–one enzyme hypothesis | biology | …
India in the early Cretaceous, and Gondwana's breakup beginning about 150 mya is generally considered the birth of the . By the Cretaceous’s end, India was alone and swiftly moving toward Southern Asia and a tremendous collision that and . The , and mountain-building events (, ) continued in western North America. In the late Cretaceous, the and the volcanic hotspot that created that is currently represented by the Hawaiian Islands first appeared. In the late Cretaceous, the Tethys Ocean connected with the Pacific and created a world-circling tropical current, which , and contributed to anoxic events. North America’s Great Plains in the Cretaceous.
Making mounds from corpses of defeated soldiers was common in official accounts of battles during the third millennium BCE. One of the first walled cities was Uruk’s colonial settlement , which was founded around 3500 BCE along the Euphrates in today’s Syria, but it was abandoned after several generations. Those wars led to the first written treaties, which were largely concerned with citizens who found themselves on the wrong side of the new border. Conscription was an early feature of civilization, closely akin to slavery, although the arrangement was temporary and conscripted soldiers were often promised land for their coerced services. Draft-dodging became one of early civilization’s art forms.
The One Gene-One Enzyme Hypothesis - …
By about 45-40 kya, that northward migrating band from the founder group reached Europe. Although the exact route is in dispute, the supports the idea that the group originated from a migration into the , probably via the east end of the Arabian Peninsula. Those invaders are called Cro-Magnons today. When they reached the Levant, they began , and Neanderthals began disappearing. The process took several thousand years at minimum, and has been called a border war with Neanderthals, while others have called it a genetic assimilation. The way that humans drove the megafauna to extinction, and then engaged in warfare as they were driving the megafauna extinction, seems to favor a violent end for Neanderthals, and the “blitzkrieg” of humans migrating across the length and breadth of Australia in a few thousand years was not in evidence for the migration/invasion around the Mediterranean’s periphery. Neanderthals (nor ), do not seem to have gone quietly or easily and may have been the biggest obstacle to Earth’s conquest by behaviorally modern humans.
The genetic testing that has been performed on humanity in the past generation has shown that the founder group’s pattern of migration was to continually spread out, and once the original settlement covered the continents, people did not move much at all, at least until Europe began conquering the world (and there were some ). There is little sign of warfare in those early days of migration, and the leading hypothesis is that people moved to the next valley rather than be close enough to fight each other. Any conflict would have been easily resolved by moving farther out, where more easily killed animals lived. Also, in those virgin continents, people need not have roamed far to obtain food. Today, an !Kung woman will carry her child more than 7,000 kilometers before the child can walk for himself/herself. If an !Kung woman bears twins, it is her duty to pick which child to murder, because she cannot afford to carry two. That demonstrates the limitations of today’s hunter-gatherer lifestyle, but in those halcyonic days of invading virgin continents (which had to be the Golden Age of the Hunter-Gatherer), those kinds of practices probably waned and bands grew fast. When they they split, and the new group moved to new lands where the animals, again, never saw people before. Unlike the case with humans, there would not have been a grapevine so that animals told their neighbors about the new super-predator. The first time that those megafauna saw humans was probably their last time. It is very likely, just as with all predators for all time, and as can be seen with historical hunting events such or , that those bands soon took to killing animals, harvesting the best parts, and moving on. To them it would not have been a “blitzkrieg,” but more like kids in candy stores. After a few thousand years of grabbing meat whenever the fancy took them, or perhaps less, those halcyonic days were over as the far coasts of Australia were reached and the easy meat was gone. When that land bridge formed to Tasmania about 43 kya, people crossed and were able to , until all the megafauna was gone on Tasmania. They also may have worked their way through the food chain, in which the first kills were the true mother lode. Nobody even deigned to raise a spear at anything less than a until they were gone. Then they started killing smaller prey, which eventually did wise up and were harder to kill, so humans had to work at it again and the brief golden age was over. The as they shaped the new continent to their liking, maybe recreating the savanna conditions that they left in Africa, may have also been used to flush out animals if they began to avoid humans.
George W. Beadle's One Gene-One Enzyme Hypothesis …
Another important energy concept is efficiency. For the hunter-gatherers who cooked food over the campfire, the energy was used with an efficiency of less than 5% (the energy that benefited the user, such as cooking the food, warming the air, providing light, etc.). When humans began using hearths as they became more sedentary, their energy efficiency increased. As humans built dwellings and fireplaces, energy efficiency increased, and today, energy efficiency in advanced industrialized civilization reaches more than 35%. As humans kept increasing their gross energy input and the efficiency in using the energy, the . Just as , an increased energy surplus meant an easier life and a better chance of survival. In recent years, while the USA’s GDP-per-capita has risen, its energy-consumption-per-capita . Some have argued that it shows how much more efficient the USA’s economy has become, but it is more likely related to the USA’s de-industrialization, as heavy industry has moved to low-wage nations with weak environmental laws. The USA imports more finished goods in which the energy for mining and manufacturing them was used in other nations, like the imperial subsidy that the British received from their colonies, but far more pronounced when the USA is receiving finished industrial goods and not raw materials, as the British received from India. In generating energy, so-called technological societies have as advanced industrial ones, largely due to the .
In very real terms, economic production relies on work performed, and the is what economic work is rooted in. Moving an automobile or airplane requires work. Moving water requires work, as does running a household appliance or computer. Electricity can power a machine or a light. Energy consumption work to be performed, and that is why . Neoclassical economists, with their supply and demand curves and other social/monetary constructs generally disregard that relationship, as they abandoned the real world for social theories, which is why . Those all-too-rare economists challenging neoclassical economics from a scientific perspective focus on energy above all else, and the labor and technological capital ( capital, not the accounting claim on it that capitalists have) that use that energy to turn material resources into useful products and services. They focus on the real economy and actual human benefit, in what I call the anthropocentric economy.
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One gene, One enzyme Hypothesis Flashcards | Quizlet
Mass extinctions always have critical geophysical aspects to them, and often geochemical. Continental shelves under shallow seas, which are home to most marine life, are vulnerable to sea level and oceanic current changes. Stagnant waters, or waters that have too many nutrients dumped into them, can lose their oxygen, which triggers anoxic events that kill complex life. A continental shelf exposed to the atmosphere by a falling sea level would obviously lose its marine life, and that marine life might have had nowhere else to go. Sea levels can rise or fall for different reasons. The most obvious reason has been advancing and retreating ice sheets, as water is removed from or added to the oceans, but the aggregate continental landmass has always grown (possibly sporadically), continents can rise and can fall during the journeys of their tectonic plates, and the ocean’s collective basin has fluctuated in size, as water was hydrated into rocks, and also falling when and rising again as they fragmented. Generally, when , the continental shelves lost their marine life, and , anoxic conditions often accompanied them. There is evidence that the ozone layer has been periodically damaged, which stressed all plants and animals that the Sun directly shined on. The positions of the continents, both in relation to each other and their proximity to the equator or poles, can have dramatic effects, including impacts on global climate. Global climate changes and moving continents can turn rainforests into deserts and vice versa.
What is one gene one enzyme theory? - Quora
Since the most dramatic instances of speciation seem to have happened in the aftermath of mass extinctions, this essay will survey extinction first. A corollary to is that if any critical nutrient falls low enough, the nutrient deficiency will not only limit growth, but the organism will be stressed. If the nutrient level falls far enough, the organism will die. A human can generally survive between one and two months without food, ten days without water, and about three minutes without oxygen. For nearly all animals, all the food and water in the world are meaningless without oxygen. Some microbes can switch between aerobic respiration and fermentation, depending on the environment (which might be a very old talent), but complex life generally does not have that ability; nearly all aerobic complex life is oxygen dependent. The only exceptions are marine life which has adapted to . Birds can go where mammals cannot, , for instance, or being , due to their . If oxygen levels rise or fall very fast, many organisms will not be able to adapt, and will die.
"Genetics", One Gene One Enzyme Hypothesis - YouTube
Recent environmental studies show that disturbed ecosystems can have cascading failures, as the removal of one part of a food chain can in , and entire ecosystems can go extinct. Cascades in today's world usually begin when the apex predator is removed (by humans, and called a ), but not always. Those cascading events can happen in aquatic and environments. Food chains are essentially energy chains , and the more complex they are, the more energy is required to sustain them. The leading hypothesis for why is also an energy-scarcity dynamic. Also, the most compelling findings that I have encountered regarding degenerative disease in humans shows that if individual cells no longer have their nutritional needs met by the organism, they stop acting out their role as specialized cells and “.” It may be difficult-to-impossible for scientists to reconstruct and test cascading failure hypotheses in ancient mass extinction events, but they may have played a major role in them, if not the dominant role.
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