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A Unique Acyl-Acyl Carrier Protein Fatty Acid Desaturase Gene from
A Unique Acyl-Acyl Carrier Protein Fatty Acid Desaturase Gene from

... The gene codes for a Δ9 14:0-ACP fatty acid desaturase. This enzyme places a double bond at the Δ9 position of 14:0-ACP fatty acid substrate thereby producing the Δ9 14:1 unsaturated fatty acid. Many plants, including geraniums, efficiently elongate this unsaturated fatty acid to two unique fatty ac ...
Topic 3 The Chemistry of Life
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... o Its importance in accounting for the ability of some enzymes to bind to several substrates should be mentioned. o Scientific truths are often pragmatic. We accept them as true because they give us predictive power, that is, they work. The German scientist Emil Fischer introduced the lock-and-key m ...
Biochemistry Course #: - College of Pharmacy at Howard University
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... Promote chemical reactions in Anabolism and Catabolism ...
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... bacteria in the gut is causing systemic effect. Toxic byproducts that are absorbed can only be measured in the urine. Additionally many species that cause dysbiosis are anaerobic. They only grow in an oxygen free environment, which means as soon as a stool specimen is collected it is exposed to oxyg ...
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... G. Regulation of TCA cycle Allosteric regulation of TCA cycle enzymes NADH, ATP, Acetyl CoA are allosteric regulators PDH regulation by phosphorylation H. Lipid and protein catabolism; and protein and nucleic acid anabolism via TCA cycle Amphibolic cycle IV. Electron Transport A. Electron transport ...
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MEMBRANE-BOUND ELECTRON TRANSFER AND ATP

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Metabolism



Metabolism (from Greek: μεταβολή metabolē, ""change"") is the set of life-sustaining chemical transformations within the cells of living organisms. These enzyme-catalyzed reactions allow organisms to grow and reproduce, maintain their structures, and respond to their environments. The word metabolism can also refer to all chemical reactions that occur in living organisms, including digestion and the transport of substances into and between different cells, in which case the set of reactions within the cells is called intermediary metabolism or intermediate metabolism.Metabolism is usually divided into two categories: catabolism, the breaking down of organic matter by way of cellular respiration, and anabolism, the building up of components of cells such as proteins and nucleic acids. Usually, breaking down releases energy and building up consumes energy.The chemical reactions of metabolism are organized into metabolic pathways, in which one chemical is transformed through a series of steps into another chemical, by a sequence of enzymes. Enzymes are crucial to metabolism because they allow organisms to drive desirable reactions that require energy that will not occur by themselves, by coupling them to spontaneous reactions that release energy. Enzymes act as catalysts that allow the reactions to proceed more rapidly. Enzymes also allow the regulation of metabolic pathways in response to changes in the cell's environment or to signals from other cells.The metabolic system of a particular organism determines which substances it will find nutritious and which poisonous. For example, some prokaryotes use hydrogen sulfide as a nutrient, yet this gas is poisonous to animals. The speed of metabolism, the metabolic rate, influences how much food an organism will require, and also affects how it is able to obtain that food.A striking feature of metabolism is the similarity of the basic metabolic pathways and components between even vastly different species. For example, the set of carboxylic acids that are best known as the intermediates in the citric acid cycle are present in all known organisms, being found in species as diverse as the unicellular bacterium Escherichia coli and huge multicellular organisms like elephants. These striking similarities in metabolic pathways are likely due to their early appearance in evolutionary history, and their retention because of their efficacy.
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