8. Respiration
Electron Transport Chain
8. Respiration
Electron Transport Chain
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- Multiple Choice
In the electron transport chain, the final electron acceptor is:
a) H2O.
b) CO2.
c) H2O.
d) O2.
e) NAD+.
- Multiple Choice
Which of the following events takes place in the electron transport chain?
a) The breakdown of glucose into six carbon dioxide molecules.
b) The breakdown of NADH and FADH2 to carbon dioxide.
c) Harnessing energy from high-energy electrons derived from glycolysis, pyruvate oxidation, and the Krebs cycle.
d) Substrate-level phosphorylation.
- Multiple ChoiceMost of the electrons removed from glucose by cellular respiration are used for which of the following processes?
- Multiple ChoiceWhich of the following best describes the electron transport chain?
- Open QuestionIn mitochondria, exergonic redox reactionsa. are the source of energy driving prokaryotic ATP synthesis.b. provide the energy that establishes the proton gradient.c. reduce carbon atoms to carbon dioxide.d. are coupled via phosphorylated intermediates to endergonic processes
- Open QuestionCyanide binds to at least one molecule involved in producing ATP. If a cell is exposed to cyanide, most of the cyanide will be found within thea. mitochondria.b. ribosomes.c. peroxisomes.d. lysosomes.
- Open QuestionWhen electrons flow along the electron transport chains of mitochondria, which of the following changes occurs?a. The pH of the matrix increases.b. ATP synthase pumps protons by active transport.c. The electrons gain free energy.d. NAD+ is oxidized.
- Open QuestionThe poison cyanide binds to an electron carrier within the electron transport chain and blocks the movement of electrons. When this happens, glycolysis and the citric acid cycle soon grind to a halt as well. Why do you think these other two stages of cellular respiration stop? (Explain your answer.)a. They run out of ATP.b. Unused O2 interferes with cellular respiration.c. They run out of NAD+ and FAD.d. Electrons are no longer available.