311C Respiration_worksheet+A1

311C Respiration_worksheet+A1 - Dehydrogenases transfer...

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NAME _______ KEY _________________ Bio 311C Worksheet: Energy Harvesting Pathways 1. What is oxidation? Reduction? Oxidation: loss of electrons (OIL) Reduction: gain of electrons (RIG) 2. What is a reducing agent? An oxidizing agent? Reducing agent: electron donor (reduces another substance) Oxidizing agent: electron acceptor (oxidizes another substance) 3. What is NAD? What is its function in aerobic energy harvesting (cellular respiration)? What is the generic name of the enzyme that catalyzes the reduction of NAD? During which stages is it reduced? During which stages is it oxidized? Which of these reactions is exergonic? Endergonic? NAD is a coenzyme that carries electrons in the cell (nicotinamide adenine dinucleotide). In cellular respiration, it carries high-energy electrons from organic fuels to the electron transport chain.
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Unformatted text preview: Dehydrogenases transfer electrons from organic fuels to NAD+ NADH. NAD+ is reduced during glycolysis, pyruvate oxidation and the citric acid cycle. NADH is oxidized during oxidative phosphorylation (ETC). Oxidation of NADH is exergonic; reduction of NAD+ is endergonic. 4. What is substrate-level phosphorylation? During which phases of cellular respiration does substrate-level phosphorylation occur? Mode of ATP synthesis where an enzyme transfers a phosphate group from a substrate molecule (organic molecule) to ADP. Occurs in glycolysis and the citric acid cycle. 13. What is chemiosmosis? What is the name of the enzyme involved in making ATP? Chemiosmosis: using H+ gradient to do work (make ATP). ATP synthase is the enzyme that uses the H+ gradient to make ATP....
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