Notes 06 Cellular Respiration

Notes 06 Cellular Respiration - Cellular Respiration...

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Cellular Respiration Introduction – all forms of life depend directly or indirectly on light energy captured during photosynthesis – glucose molecules are broken down back into carbon dioxide and water (molecules the plant started with)
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ATP – Adenosine triphosphate most common energy carrier in cells nucleotide composed of adenine, the sugar ribose, and three phosphate groups synthesized from adenosine diphosphate (ADP) and inorganic phosphate – process is called phosphorylation during glucose breakdown, energy is release and stored in bonds of ATP
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Summary of complete glucose metabolism: Photosynthesis: 6CO 2 + 6H 2 O + sunlight energy C 6 H 12 O 6 + 6O 2 Complete glucose metabolism: C 6 H 12 O 6 + 6O 2 6CO 2 + 6H 2 O + chemical and heat energies
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Glycolysis first stage of aerobic respiration does not require O 2 ( anaerobic) and proceeds in exactly the same way under both aerobic (with oxygen) and anaerobic (without oxygen) conditions Splits apart a single glucose molecule (6 carbon) into two molecules of pyruvate (3 carbon) under anaerobic conditions, pyruvate converted by fermentation to lactic acid or ethanol occurs in cytoplasm pyruvate may enter mitochondria if oxygen available – breaks pyruvate down completely to CO 2 and water generating an additional 34 to 36 ATP – aerobic respiration each step (reaction) is catalyzed by an enzyme
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products are 2 molecules of ATP and 2 molecules of NADH nicotinamide adenine dinucleotide – an electron carrier that transports energy in form of energetic electrons - Coenzyme electrons are held in high-energy outer electron shells – NAD + NADH donates the electrons and their energy to other molecules hydrogen ions are often picked up simultaneously
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formed through oxidation/reduction reactions – involves two complementary reactions oxidation – liberates energy from the oxidation substance; results from the removal of one more electrons, alone or with H + reduction – stores energy in a reduced compound; reduction results from addition of one or more electrons, alone or with H +
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This note was uploaded on 10/09/2010 for the course SCI Bio taught by Professor Lin during the Spring '09 term at Walnut Hill.

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Notes 06 Cellular Respiration - Cellular Respiration...

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