Microbiology: An Evolving Science (Fourth Edition)
4th Edition
ISBN: 9780393615098
Author: John W. Foster, Joan L. Slonczewski
Publisher: W. W. Norton & Company
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Chapter 13.6, Problem 1TQ
Summary Introduction
To review:
The fate of electrons transferred from catabolic substrates in a situation where oxygen and other electron acceptors are absent.
Introduction:
Glucose is the main molecule that serves as food for cells but is too dynamic to be used directly in most
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Microbiology: An Evolving Science (Fourth Edition)
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- What molecule acts as an electron acceptor in glycolysis?arrow_forwardThe reaction pictured is an oxidation-reduction reaction in the citric acid cycle in which the energy-carrier molecule NADH is generated. Identify which molecule in the reaction will be oxidized and which molecule will be reduced. Place a single answer choice in each box. COO- HO-C-H H-C-H COO- Malate NAD+ NADH + H+ Oxidized malate oxaloacetate COO- H-C-H ī COO- Oxaloacetate Reduced NADH NAD+arrow_forwardDCCD (diocyclohexylcarbodiimide) inhibits oxidative phosphorylation when the substrate is mitochondrial NADH. DCCD is a drug that binds to ATP synthase and blocks proton transport through the ion channel. a) Explain what the consequences of DCCD on cellular energy production are. b) Suggest at least one other cellular effect of DCCD and explain this effect.arrow_forward
- The coenzymes NAD+ and NADP+ are important electron carriers that pick up electrons from one pathway and deliver them to another. Below is a list of pathways or enzyme complexes that we have covered in class. Indicate which coenzyme these pathways or complexes produce by writing NAD+, NADP+, NADH or NADPH in the blank provided. ________ glycolysis ________ citric acid cycle ________ alcoholic fermentation ________ pyruvate dehydrogenase complex ________ gluconeogenesis ________ mitochondrial electron transport ________ photosynthesis light reactions ________ photosynthesis dark reactionsarrow_forwardA proton gradient is created during the electron transport chain using the energy released from the oxidation of NADH and FADH2. The protons then cross the membrane through ATP synthase down their electrochemical gradient, and ATP is produced. This is an example of A) energy coupling B) cotransport C) allosteric regulation.arrow_forwardArrange the following events in the order in which they occur in a catabolic process: electron transport, digestion, oxidative phosphorylation, citric acid cycle.arrow_forward
- Why does the hydrolysis of ATP to ADP involve the release of energy?arrow_forwardAt what point in glycolysis are all the reactions considered doubled?arrow_forward*Determine the ATP yield from the metabolism of one molecule of glucose under the following conditions: a) b) c) in a mammalian muscle cell carrying out anaerobic glycolysis. in Escherichia coli, an aerobic prokaryote in a mammalian brown fat cell, in which electron transport occurs without producing ATParrow_forward
- Why Are Coupled Reactions Important in Glycolysis?arrow_forwardIn cellular respiration, will metabolic water be produced if an inhibitor that blocks the transfer of electrons in the electron transport chain is present?arrow_forwardIn terms of an electron-transport chain, what is the difference between a reduced carrier and an oxidized carrier?arrow_forward
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