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Campbell Biology 9th Edition - Chapter 9 Flashcards

Cellular Respiration and Fermentation

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896106865fermentationa partial degradation of sugars or other organic fuel that occurs without the use of oxygen.
896106866aerobic respirationin which oxygen is consumed as a reactant along with the organic fuel
896106867anaerobic respirationa catabolic pathway in which oxygen is not consumed as a reactant along with the organic fuel
896106868oxidationloss of electrons
896106869reductionGain of electrons
896106870reducing agentThe electron donor in a redox reaction.
896106871oxidizing agentThe electron acceptor in a redox reaction
896106872NAD+a derivative of the vitamin niacin, well suited as an electron carrier because it can cycle easily between oxidized and reduced states. As an electron acceptor it functions as an oxidizing agent during respiration
896106873electron transport chainA sequence of electron carrier molecules (membrane proteins) that shuttle electrons during the redox reactions that release energy used to make ATP. (see electron transport chain cards)
896106874citric acid cycleA chemical cycle involving eight steps that completes the metabolic breakdown of glucose molecules to carbon dioxide; occurs within the mitochondrion; the second major stage in cellular respiration (see citric acid cards)
896106875glycolysisfirst step in releasing the energy of glucose, in which a molecule of glucose is broken into two molecules of pyruvic acid (see glycolysis cards)
896106876oxidative phosphorylationThe production of ATP using energy derived from the redox reactions of an electron transport chain.
896106877substrate level phosphorylationThe formation of ATP by directly transferring a phosphate group to ADP from an intermediate substrate in catabolism.
896106878chemiosmosisin chloroplasts and mitochondria, a process in which the movement of protons down their concentration gradient across a membrane is coupled to the synthesis of ATP
896106879proton motive forcethe potential energy stored in the form of an electrochemical gradient, generated by the pumping of hydrogen ions across biological membranes during chemiosmosis
896106880alcohol fermentationThe conversion of pyruvate to carbon dioxide and ethyl alcohol
896106881lactic acid fermentationThe conversion of pyruvate to lactate with no release of carbon dioxide.
896106882obligate anaerobesorganisms that cannot live where molecular oxygen is present
896106883facilitative anaerobesorganisms that can grow with or without oxygen aerobic or anaerobic . grow better aerobically ...because anaerobically they use less efficient respiration
896106884beta oxidationA metabolic sequence that breaks fatty acids down to two-carbon fragments which enter the Krebs cycle as acetyl CoA.

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