8. Respiration

Which one of the following molecules is a by-product of cellular respiration?

a) Water.

b) Glucose.

c) Pyruvate.

d) Oxygen.

e) ADP.

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Which of the summary statements below describes the results of the following reaction?

C₆H₁₂O₆ + 6 O₂ → 6 CO₂ + 6 H₂O + Energy

a) C₆H₁₂O₆ is oxidized and O₂ is reduced.

b) O₂ is oxidized and H₂O is reduced.

c) CO₂ is reduced and O₂ is oxidized.

d) O₂ is reduced and CO₂ is oxidized.

Based on the map of cellular respiration, why do we need to breathe in oxygen?

a) Oxygen is the final electron acceptor for lactic acid fermentation.

b) Oxygen is the final electron acceptor for alcohol fermentation.

c) Oxygen is the final electron acceptor for aerobic cellular respiration.

d) Oxygen is not important for the purposes of cellular respiration.

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The function of cellular respiration is to __________.

Which of the following is a correct description of the events of cellular respiration in proper sequence?

A biochemist wanted to study how various substances were used in cellular respiration. In one experiment, she allowed a mouse to breathe air containing O2 'labeled' by a particular isotope. In the mouse, the labeled oxygen first showed up in a. ATP. b. NADH. c. CO2. d. H2O.

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What are the reactants and products of cellular respiration?

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If you were to expose cells that are undergoing aerobic respiration to a radioactive oxygen isotope in the form of O2, which of the following molecules would you expect to be radiolabeled? a. pyruvate b. water c. NADH d. CO2

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Cellular respiration involves . a. the aerobic metabolism of sugars in the mitochondria by a process called glycolysis; b. an electron transport chain that releases carbon dioxide; c. the synthesis of ATP, which is driven by the rushing of protons through an ATP synthase; d, electron carriers that bring electrons to the citric acid cycle; e. the production of water during the citric acid cycle

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The text claims that the evolution of an oxygen-rich atmosphere paved the way for increasingly efficient cellular respiration and higher growth rates in organisms. Explain.

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