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biology 422 - TeacherWeb
biology 422 - TeacherWeb

... 11. What type of molecule is NAD+ and what is its role? 12. What, if any, changes occur in the pathway of glycolysis in the absence of oxygen? 13. How does fermentation allow glycolysis to occur when oxygen is not present? ...
MINERALS AND TRACE ELEMENTS - Univerzita Karlova. Prague
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... Food iron is predominantly in the ferric state. In the stomach, where the pH is less than 4, Fe3+ can dissociate and react with low-molecular weight compounds such fructose, ascorbic acid, citric acid, amino acids to form ferric complexes soluble in neutral pH of intestine fluid. A protein DMT1 (di ...
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Cellular Respiration Guided Reading Notes Section 7
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... 6. If there is no oxygen in cells, the products of glycolysis enter ________________________ pathways that yield no additional ______________________. 7. Fermentation is __________________________ because no oxygen is used. 8. If oxygen is present in cells, the glycolysis products enter the ________ ...
EXAM III KEY - the Complex Carbohydrate Research Center
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... __T___ 9) Most of the free energy needed to drive ATP formation in the mitochondria is the result of an electrical contribution from a charge gradient across the inner mitochondrial membrane. __T___ 10) Complex II participates in both the electron transport chain and the citric acid cycle. __T___ 11 ...
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... Essential Amino Acids • The biosynthesis of proteins requires the presence of all the constituent amino acids • Some species, including humans, cannot produce all of the amino acids and they must come from ____________ and are called essential amino acids ...
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... used to pump protons into the lumen of the thylakoid, creating a gradient of protons across the thylakoid membrane. The electrons finally join NADP+ and, along with protons, form NADPH. The chloroplast ATP synthase uses the potential energy in the proton gradient to make ATP. Both NADPH and ATP are ...
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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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