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Biochemistry - Ursuline High School
Biochemistry - Ursuline High School

... • Resist pH shifts. • Cells and other biological solutions often contain buffers to prevent damage. ...
The tissues main that are found in a mesophytic leaf are epidermal
The tissues main that are found in a mesophytic leaf are epidermal

... to absorb the water and rehydration of living cells in the seed then this makes the cell metabolically active. After the absorption of the water a plant called gibberellins is produced in the cotyledons of the seed. Gibberellin produces an amylase which creates a chemical reaction in digestion with ...
KEY - chem.uwec.edu
KEY - chem.uwec.edu

... cancels the NADH produced and the second NADH can reduce FAD via the electron transport system (and “reverse” electron transport by NADH oxidation by NADH-Q oxidoreductase? QH2FAD). This may produce another ATP in the proton gradient formed. The end product would be succinate. 5. Some organisms ca ...
chapter 9 cellular respiration: harvesting chemical energy
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... the fuel to oxygen at one time. Rather, glucose and other fuels are broken down in a series of steps, each catalyzed by a specific enzyme.  At key steps, electrons are stripped from the glucose.  In many oxidation reactions, the electron is transferred with a proton, as a hydrogen atom. ...
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Living Things - Somerset Area School District

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key - Scioly.org
key - Scioly.org

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... The flow of chemical elements and compounds between living organisms and the physical environment. Chemicals absorbed or ingested by organisms are passed through the food chain and returned to the soil, air, and water by such ...
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... 6.1 Photosynthesis and cellular respiration provide energy for life  Energy in sunlight is used in photosynthesis to make glucose from CO2 and H2O with release of O2  Other organisms use the O2 and energy in sugar and release CO2 and H2O  Together, these two processes are responsible for the maj ...
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marine ecology - Raleigh Charter High School
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... 1. gross primary productivity: rate of production of organic matter by photosynthesis or chemosynthesis in a certain place in a given amount of time; primarily determined by the light and nutrient availability 2. net primary productivity: gross primary productivity minus the rate of cellular respir ...
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Nutritional Diseases - Texas A&M University
Nutritional Diseases - Texas A&M University

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... PYRUVATE OXIDATION TO ACETYL CoA • Pyruvate oxidation to acetyl CoA occurs in the mitochondria. • Most of the acetyl CoA will be completely oxidized to CO2 in the citric acid cycle. • Some acetyl CoA will serve as starting material for fatty acid biosynthesis. • NAD+ is regenerated when NADH transf ...
Unit 1: Life Science: Sustainability of Ecosystems
Unit 1: Life Science: Sustainability of Ecosystems

... 3. Describe how fossil fuels are cycled through the carbon/oxygen cycle. 4. Describe how carbonate compounds are produced and released in the carbon/oxygen cycle. 5. What are three ways that an excess of carbon dioxide can be released into the atmosphere? How can the amount of oxygen be reduced? Sec ...
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Photosynthesis



Photosynthesis is a process used by plants and other organisms to convert light energy, normally from the Sun, into chemical energy that can be later released to fuel the organisms' activities. This chemical energy is stored in carbohydrate molecules, such as sugars, which are synthesized from carbon dioxide and water – hence the name photosynthesis, from the Greek φῶς, phōs, ""light"", and σύνθεσις, synthesis, ""putting together"". In most cases, oxygen is also released as a waste product. Most plants, most algae, and cyanobacteria perform photosynthesis; such organisms are called photoautotrophs. Photosynthesis maintains atmospheric oxygen levels and supplies all of the organic compounds and most of the energy necessary for life on Earth.Although photosynthesis is performed differently by different species, the process always begins when energy from light is absorbed by proteins called reaction centres that contain green chlorophyll pigments. In plants, these proteins are held inside organelles called chloroplasts, which are most abundant in leaf cells, while in bacteria they are embedded in the plasma membrane. In these light-dependent reactions, some energy is used to strip electrons from suitable substances, such as water, producing oxygen gas. Furthermore, two further compounds are generated: reduced nicotinamide adenine dinucleotide phosphate (NADPH) and adenosine triphosphate (ATP), the ""energy currency"" of cells.In plants, algae and cyanobacteria, sugars are produced by a subsequent sequence of light-independent reactions called the Calvin cycle, but some bacteria use different mechanisms, such as the reverse Krebs cycle. In the Calvin cycle, atmospheric carbon dioxide is incorporated into already existing organic carbon compounds, such as ribulose bisphosphate (RuBP). Using the ATP and NADPH produced by the light-dependent reactions, the resulting compounds are then reduced and removed to form further carbohydrates, such as glucose.The first photosynthetic organisms probably evolved early in the evolutionary history of life and most likely used reducing agents, such as hydrogen or hydrogen sulfide, as sources of electrons, rather than water. Cyanobacteria appeared later; the excess oxygen they produced contributed to the oxygen catastrophe, which rendered the evolution of complex life possible. Today, the average rate of energy capture by photosynthesis globally is approximately 130 terawatts, which is about three times the current power consumption of human civilization.Photosynthetic organisms also convert around 100–115 thousand million metric tonnes of carbon into biomass per year.
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