Describe the cell cycle. Include in your discussion the role cyclins and CDKs play in controlling this cycle. The cell cycle is a process that cells undergo to grow‚ reproduce‚ and divide to make 2 daughter cells. The cell cycle has different stages including G1‚ S‚ G2‚ and the M phase. Also we have the G0 phase. There are checkpoints that control the transitions between the phases of the cell cycle in which the process is regulated by cyclins and cyclin-dependent kinases (CDKs). G1 is known as
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Adulteration of food and pollution "Adulteration" is a legal term meaning that a food product fails to meet federal or state standards. Food is the basic necessity of life. One works hard and earns to satisfy our hunger and relax (enjoy) later. But at the end of the day‚ many of us are not sure of what we eat. We may be eating a dangerous dye‚ sawdust‚ soapstone‚ industrial starch‚ and aluminum foil and so on! Contaminated foods and drinks are common sources of infection. Often‚ we invite diseases
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Human Impact on the Environment Every living thing has an impact on its environment. Therefore a human impact on the environment is inevitable. By simply existing‚ all species - including ourselves - will imprint their mark on the world around them. What differentiates us from other species is our ability to greatly overburden our environment with very few limits. The information regarding our human impact is vast and impossible to cover in one article but I will attempt to cover a basic overview
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Topic 2: The Ecosystem 2.1.1 Biotic: living factors or components‚ e.g. plants and animals. Abiotic: non-living factors or components‚ e.g. soil‚ water‚ wind‚ etc… 2.1.2 Trophic level: is the position that an organism or a group of organisms in a community occupies in a food chain. 2.1.3 A food chain shows the flow of energy from one organism to the next. A food web is a complex network of interrelated food chains. Producers (autotrophs): manufacture their
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paper is to explain some of the relationships between energy consumption and air pollution. Personally‚ when I first started thinking about the topic‚ I thought I already had the answers. The equation was pretty simple and did not take much thought: higher energy = higher air pollution. This thought was incorrect‚ as I quickly found out. The very first website looked at showed that over the last thirty years‚ energy consumption and air pollution do not always go hand in hand. However‚ in some places
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Describe the spatial patterns and dimensions of one (1) ecosystem at risk‚ and analyse the negative impacts of human activity on this ecosystem. One ecosystem at risk that has been studied is the coral reef; The Great Barrier Reef is located off the East coast of Northern Queensland. It stretches approximately 2300km from Papua New Guinea to Fraser Island. Overall the Great Barrier Reef system covers an area of over 348‚000km2 making a vast‚ very complex ecosystem. There is a long history of human
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Environmental Impacts on Ecosystems Introduction An ecosystem is a community of living organisms (plants‚ animals and microbes) in conjunction with the nonliving components of their environment (things like air‚ water and mineral soil)‚ interacting as a system. These biotic and abiotic components are regarded as linked together through nutrient cycles and energy flows. Ecosystems are controlled both by external and internal factors. Once outside factors affect these systems
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Biogeochemical Cycles and Human Impacts The carbon cycle‚ nitrogen cycle‚ and phosphorus cycle all play a big role in our environment. They are some of the key components that are recycled to create pathways know as the biogeochemical cycles. All the chemical elements that make up living cells must be recycled continuously in order for the living components of a major ecosystem to survive. The recycling of these elements is the only possible way to maintain a dynamic system. Human impacts of these
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People must use less energy‚ conserve nonrenewable resources‚ and minimize their negative impact on Earth. An example of this new way of living is that of Colin Beavan in his book‚ “No Impact Man.” It is a true story about the year he spent having no impact on the earth and living an entirely eco-effective life. Along with his family‚ he does so by minimizing his use of electricity‚ generating no waste‚ and watching every move they make to ensure his family makes no impact on Earth. Beavan is
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ISSN 0254-4725 Food energy – methods of analysis and conversion factors FAO FOOD AND NUTRITION PAPER 77 Ingested energy (IE) = gross energy (GE) Faecal energy (FE) Combustible gas (GaE) (from microbial fermentation) Digestible energy (DE) Urinary energy (UE) Surface energy (SE) Metabolizable energy (ME) Heat of microbial fermentation Obligatory thermogenesis‚ i.e. excess heat relative to glucose during ATP synthesis Net (metabolizable) energy (NME) Non-obligatory dietary thermogenesis
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