Cellular Respiration Quiz
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Questions and Answers

What is the main role of ATP in cellular respiration?

  • It transports organic molecules into cells.
  • It stores chemical energy in a stable form.
  • It facilitates redox reactions.
  • It powers cellular work. (correct)

    • Which term describes the process that partially breaks down sugars without the use of oxygen?

  • Oxidation
  • Anaerobic respiration
  • Fermentation (correct)
  • Aerobic respiration

    • In cellular respiration, what happens to glucose?

  • It is synthesized to produce energy.
  • It is oxidized to release energy. (correct)
  • It is completely degraded without any energy yield.
  • It remains unchanged throughout the process.

    • What is the primary difference between aerobic and anaerobic respiration?

    <p>Aerobic respiration requires oxygen, anaerobic does not.</p> Signup and view all the answers

    What role does NAD+ play in cellular respiration?

    <p>It functions as a coenzyme and electron carrier.</p> Signup and view all the answers

    Which of the following statements accurately describes the electron transport chain?

    <p>It accepts electrons in a series of redox reactions.</p> Signup and view all the answers

    What process represents the loss of electrons in a redox reaction?

    <p>Oxidation</p> Signup and view all the answers

    Which of the following gases is released during cellular respiration?

    <p>Carbon dioxide</p> Signup and view all the answers

    Which compound is known as the oxidizing agent in a redox reaction?

    <p>Electron receptor</p> Signup and view all the answers

    What is the final electron acceptor in cellular respiration?

    <p>O2</p> Signup and view all the answers

    How much ATP is produced per glucose molecule during fermentation?

    <p>2 ATP</p> Signup and view all the answers

    Which type of organisms can utilize both fermentation and cellular respiration?

    <p>Facultative anaerobes</p> Signup and view all the answers

    What is the primary role of glycolysis in metabolism?

    <p>Funnel electrons from a wide range of carbohydrates</p> Signup and view all the answers

    What is feedback inhibition in the context of cellular respiration?

    <p>A method of controlling enzyme activity at strategic points</p> Signup and view all the answers

    Which molecule is primarily used by glycolysis from fats?

    <p>Glycerol</p> Signup and view all the answers

    What is the primary role of NAD+ in cellular respiration?

    <p>To act as an electron acceptor</p> Signup and view all the answers

    Which stage of cellular respiration is responsible for the majority of ATP synthesis?

    <p>Oxidative phosphorylation</p> Signup and view all the answers

    What is produced when NADH is oxidized?

    <p>NAD+</p> Signup and view all the answers

    How does the electron transport chain function compared to an uncontrolled reaction?

    <p>It passes electrons in a series of steps</p> Signup and view all the answers

    What drives the process of oxidative phosphorylation?

    <p>Redox reactions</p> Signup and view all the answers

    Which process occurs first in cellular respiration?

    <p>Glycolysis</p> Signup and view all the answers

    What do electrons transported by NADH ultimately contribute to within the electron transport chain?

    <p>The synthesis of ATP</p> Signup and view all the answers

    Which of the following describes the role of oxygen in the electron transport chain?

    <p>It pulls electrons down the chain</p> Signup and view all the answers

    What is produced during the controlled release of energy through the electron transport chain?

    <p>ATP</p> Signup and view all the answers

    What is the reduced form of NAD+ called?

    <p>NADH</p> Signup and view all the answers

    What are the two major phases of glycolysis?

    <p>Energy investment phase and energy payoff phase</p> Signup and view all the answers

    Where does the citric acid cycle take place?

    <p>In the mitochondrial matrix</p> Signup and view all the answers

    What must pyruvate be converted to before entering the citric acid cycle?

    <p>Acetyl CoA</p> Signup and view all the answers

    How many ATP molecules are generated per turn of the citric acid cycle?

    <p>1 ATP</p> Signup and view all the answers

    What role do NADH and FADH2 play after the citric acid cycle?

    <p>They act as electron donors in the electron transport chain</p> Signup and view all the answers

    What is formed when oxygen receives electrons at the end of the electron transport chain?

    <p>H2O</p> Signup and view all the answers

    Which statement is true regarding substrate-level phosphorylation?

    <p>It occurs in glycolysis and the citric acid cycle.</p> Signup and view all the answers

    What is the final electron acceptor in the electron transport chain?

    <p>O2</p> Signup and view all the answers

    What type of molecule is produced by the citric acid cycle in addition to ATP?

    <p>NADH</p> Signup and view all the answers

    What happens to the energy of electrons as they move down the electron transport chain?

    <p>They drop in free energy.</p> Signup and view all the answers

    What is the primary function of the electron transport chain?

    <p>To break the energy drop from food to O2 into smaller steps</p> Signup and view all the answers

    How does ATP synthase generate ATP?

    <p>Using the proton-motive force from the movement of H+</p> Signup and view all the answers

    Which of the following describes chemiosmosis?

    <p>The coupling of redox reactions to ATP synthesis via a H+ gradient</p> Signup and view all the answers

    During anaerobic respiration, which substance can be used as an alternate electron acceptor?

    <p>Sulfate</p> Signup and view all the answers

    What is a key difference between fermentation and aerobic respiration?

    <p>Fermentation regenerates NAD+ without an electron transport chain</p> Signup and view all the answers

    How is alcohol fermentation initiated?

    <p>By converting pyruvate to ethanol in two steps and releasing CO2</p> Signup and view all the answers

    What role does NAD+ play in fermentation?

    <p>Regenerating to allow continuous glycolysis</p> Signup and view all the answers

    What is lactic acid fermentation commonly utilized in?

    <p>Production of cheese and yogurt</p> Signup and view all the answers

    Which process can occur under both aerobic and anaerobic conditions?

    <p>Glycolysis</p> Signup and view all the answers

    Which statement about the proton-motive force is accurate?

    <p>It is the energy in the form of a H+ gradient across a membrane</p> Signup and view all the answers

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