Which of the following statements about NAD⁺ is true? NAD⁺ is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle. true NAD⁺ has more chemical energy than NADH. false NAD⁺ can donate electrons for use in oxidative phosphorylation. false In the absence of NAD⁺, glycolysis can still function. false Single The oxygen consumed during cellular respiration 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 Starting with one molecule of glucose, glycolysis results in the net production of which of the following sets of energy-containing products? Two NAD+, two pyruvate molecules, and two ATP false Two NADH, two pyruvate molecules, and two ATP false Four NADH, two pyruvate molecules, and four ATP false Six CO₂, two pyruvate molecules, and two ATP true Single In glycolysis, for each molecule of glucose oxidized to pyruvate, ________. two molecules of ATP are used, and two molecules of ATP are produced false two molecules of ATP are used, and four molecules of ATP are produced true four molecules of ATP are used, and two molecules of ATP are produced  false two molecules of ATP are used, and six molecules of ATP are produced  false Single What is/are the main electron carrier(s) in the citric acid cycle? NAD+ only false NADH and FADH₂ true the electron transport chain false ADP and ATP false Single Which one of the following is formed by the removal of carbon (as CO2) from a molecule of pyruvate? ATP false acetyl CoA  true citrate false water 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 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 In the absence of oxygen, yeast cells can obtain energy by fermentation, which results in the production of which of the following sets of molecules? ATP, CO2, and ethanol (ethyl alcohol) true ATP, CO2, and lactate false ATP, NADH, and ethanol  false ATP, CO2, and acetyl CoA false Single An organism is discovered that thrives in both the presence and absence of oxygen. Interestingly, as oxygen is removed from the organism's environment, the rate of sugar consumption increases while the growth rate decreases. What do these observations suggest about the likely identity of this organism? It is an unremarkable eukaryotic organism.  false It is a photosynthetic organism. false It is an obligate anaerobic organism. false It is a facultative anaerobic organism. true Single