In which reactions of cellular respiration and fermentation does substrate-level phosphorylation occur? only in glycolysis false only in the citric acid cycle false only in the electron transport chain false in both glycolysis and the citric acid cycle  true Single Which of the summary statements below describes the results of the following reaction? C₆H₁₂O₆ + 6 O2 → 6 CO₂ + 6 H₂O + Energy C₆H₁₂O₆ is oxidized, and O₂ is reduced. true O₂ is oxidized, and H₂O is reduced. false CO₂ is oxidized, and O₂ is reduced. false O₂ is oxidized, and CO₂ is reduced. false Single When a molecule of NAD+ (nicotinamide adenine dinucleotide) gains a hydrogen atom, the molecule becomes ________. dehydrogenated false oxidized false reduced true redoxed false Single The oxygen we breathe in is directly involved in which of the following processes or events? glycolysis false accepting electrons at the end of the electron transport chain true the citric acid cycle false the oxidation of pyruvate to acetyl CoA  false Single Which of these is an electron carrier in the citric acid cycle NAD+ true ADP false ferredoxin false ATP false Single Which of the following events takes place in the electron transport chain? the breakdown of glucose into six carbon dioxide molecules false the breakdown of an acetyl group to carbon dioxide false the harnessing of energy from high-energy electrons derived from glycolysis and the citric acid cycle true substrate-level phosphorylation false Single Where are the proteins of the electron transport chain located? mitochondrial outer membrane false mitochondrial inner membrane true mitochondrial intermembrane space false mitochondrial matrix false Single Which of the following statements best describes the primary role played by oxygen in cellular respiration? It yields energy in the form of ATP as it is passed down the electron transport chain. false It oxidizes glucose to form two molecules of pyruvate. false It serves as an acceptor for carbon, forming CO₂ in the citric acid cycle. false It serves as the final acceptor for electrons from the electron transport chain. true Single Which of the following metabolic processes take place in the cytosol of a eukaryotic cell?  glycolysis and fermentation true fermentation and chemiosmosis false oxidation of pyruvate to acetyl CoA false citric acid cycle false Single Why are carbohydrates considered high-energy foods? Their chemical structure contains many hydrogen atoms whose bonds can easily be broken true They contain many oxygen atoms. false They contain no nitrogen atoms. false They are strong oxidizing molecules. false Single