Cellular Respiration Overview
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Questions and Answers

What is the primary purpose of pyruvate oxidation in cellular respiration?

  • To convert pyruvate into glucose
  • To produce oxygen for the electron transport chain
  • To prepare products of glycolysis for the citric acid cycle (correct)
  • To generate ATP directly

    • Which of the following molecules is NOT a product of pyruvate oxidation?

  • CO2
  • ATP (correct)
  • Acetyl-CoA
  • NADH

    • How many molecules of NADH are produced during pyruvate oxidation for every two pyruvate molecules?

  • 3
  • 1
  • 4
  • 2 (correct)

    • What is the total number of CO2 molecules generated from pyruvate oxidation of two pyruvate molecules?

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

    Which cycle also occurs in the mitochondrial matrix along with pyruvate oxidation?

    <p>Citric Acid Cycle</p> Signup and view all the answers

    What role does Complex IV play in electron transport?

    <p>It holds ½ O2 and donates electrons.</p> Signup and view all the answers

    What happens in the presence of carbon monoxide and cyanide regarding Complex IV?

    <p>They inhibit the electron transport chain.</p> Signup and view all the answers

    What is a consequence of oxygen not being able to accept electrons?

    <p>The aerobic stages of respiration stop.</p> Signup and view all the answers

    What is the primary purpose of NADH and FADH2 in cellular respiration?

    <p>To be oxidized and donate electrons.</p> Signup and view all the answers

    During anaerobic respiration, what occurs when oxygen is lacking?

    <p>Glycolysis proceeds with an alternative electron acceptor.</p> Signup and view all the answers

    How do protons move across the membrane in relation to ATP synthase?

    <p>They flow from the intermembrane space back into the matrix through ATP synthase.</p> Signup and view all the answers

    What is the effect of competitive inhibitors on Complex IV?

    <p>They prevent electron transfer through the complex.</p> Signup and view all the answers

    What is produced during the energy harvest phase of glycolysis?

    <p>Two molecules of NADH.</p> Signup and view all the answers

    How many ATP are produced from one molecule of NADH?

    <p>2.5 ATP</p> Signup and view all the answers

    What is the total yield of ATP produced from glycolysis?

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

    What is the yield of ATP for one molecule of FADH2?

    <p>1.5 ATP</p> Signup and view all the answers

    Which process produces the greatest number of NADH molecules?

    <p>Citric acid cycle</p> Signup and view all the answers

    During which stage of cellular respiration is acetyl-CoA produced?

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

    Which process is associated with the highest proton (H+) pumping?

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

    What is the total output of CO2 from the citric acid cycle?

    <p>4 CO2</p> Signup and view all the answers

    Which of the following outputs occurs during glycolysis?

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

    What does the term 'oxidized' refer to in the context of electron carriers?

    <p>Loss of electrons</p> Signup and view all the answers

    Which electron carrier is involved in photosynthesis?

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

    Which of the following is NOT a phase of cellular respiration?

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

    What process occurs in the cytoplasm of cells during cellular respiration?

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

    What is the main purpose of the four interconnected processes in cellular respiration?

    <p>To maximize energy production</p> Signup and view all the answers

    In which phase of cellular respiration is ATP primarily produced?

    <p>Electron Transport Chain</p> Signup and view all the answers

    Which of the following best describes the concept of entropy in energy contexts?

    <p>The amount of disorganization</p> Signup and view all the answers

    What occurs during the energy investment phase of glycolysis?

    <p>Consumption of ATP to phosphorylate glucose</p> Signup and view all the answers

    What is the main output of glycolysis?

    <p>2 Pyruvate (3-C)</p> Signup and view all the answers

    Which cycle produces the most NADH during cellular respiration?

    <p>Citric acid cycle</p> Signup and view all the answers

    How many net ATP are generated from glycolysis?

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

    Where does the electron transport chain take place?

    <p>Mitochondrial cristae</p> Signup and view all the answers

    What is produced during pyruvate oxidation?

    <p>2 acetyl-CoA</p> Signup and view all the answers

    Which of the following is NOT an output of the citric acid cycle?

    <p>2 Pyruvate (3-C)</p> Signup and view all the answers

    Total NADH produced from glycolysis and pyruvate oxidation combined?

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

    Which molecule enters the citric acid cycle?

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

    How many ATP are produced from the entire process of glycolysis?

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

    What are the byproducts of the citric acid cycle?

    <p>NADH and FADH2</p> Signup and view all the answers

    Study Notes

    Cellular Respiration

    • Cellular Respiration generates ATP (adenosine triphosphate) from glucose as a source of energy.
    • A simplified model of the complete respiration process includes:
      • Glycolysis
      • Pyruvate oxidation
      • Citric Acid Cycle
      • Electron transport chain

    Glycolysis

    • Takes place in the cytoplasm.

    • It is an anaerobic process (does not require oxygen).

    • Glycolysis breaks down glucose (a 6-carbon molecule) into two pyruvate molecules (each with 3 carbons).

    • Input: Glucose, 2 ATP, 2 NAD+

    • Outputs: 2 pyruvate (3-C), 2 NADH, 2 ATP (net total)

    Pyruvate Oxidation

    • Takes place in the mitochondrial matrix.

    • It is an anaerobic process (does not require oxygen).

    • Pyruvate is converted into Acetyl-CoA, carbon dioxide, and NADH.

    • Input: 2 Pyruvate, 2 NAD+, 2 CoA

    • Outputs: 2 acetyl-CoA, 2 NADH, 2 CO2

    Citric Acid Cycle (Krebs Cycle)

    • Takes place in the mitochondrial matrix.

    • It is an aerobic process (requires oxygen).

    • Starts by Acetyl-CoA combining with a 4-carbon molecule, oxaloacetate.

    • Energy is harvested through series of redox reactions, releasing carbon dioxide and generating ATP, NADH, and FADH2.

    • Input: 2 Acetyl-CoA, 6 NAD+, 2 FAD, 2 ADP + 2 Pi

    • Outputs: 4 CO2, 6 NADH, 2 FADH2, 2 ATP

    Electron Transport Chain

    • Takes place in the inner membrane of the mitochondria (specifically the cristae).

    • It is an aerobic process (requires oxygen).

    • Electron carriers (NADH and FADH2) from the previous stages transfer electrons through a series of protein complexes embedded in the inner membrane.

    • Energy is released as the electrons move down the chain, pumping protons (H+) from the mitochondrial matrix into the intermembrane space.

    • This creates a proton gradient across the membrane.

    • This gradient is used by ATP synthase to phosphorylate ADP to ATP via oxidative phosphorylation, a key process for generating ATP.

    • Input: 10 NADH, 2 FADH2, oxygen

    • Outputs: ATP, Water

    ATP Production

    • Glycolysis: 2 ATP (net total)

    • Citric Acid Cycle: 2 ATP

    • Electron Transport Chain: 28 ATP (from 10 NADH and 2 FADH2)

    • Total ATP yield: 32 ATP

    Anaerobic Respiration and Fermentation

    • Anaerobic respiration and fermentation occur when oxygen is not available.
    • Glycolysis can continue under anaerobic conditions.
    • Fermentation is a process that allows cells to regenerate NAD+ by reducing pyruvate into lactic acid or ethanol.

    Role of Electron Carriers

    • NADH and FADH2 are electron carriers that transfer electrons during respiration.
    • Electron carriers shuttle electrons released from chemical bonds in glucose.
    • They cycle through the electron transport chain, releasing energy that drives ATP synthesis.
    • Other electron carriers include:
      • NADP+ (in chloroplasts during photosynthesis)
      • FAD (in cellular respiration)

    Carbon Monoxide and Cyanide Inhibition

    • Carbon monoxide and cyanide are inhibitors of the electron transport chain.
    • They bind to complex IV, preventing the passage of electrons and halting ATP production.
    • This disrupts the oxygen-dependent steps of cellular respiration.

    Entropy and Energy Maximization

    • Chemical reactions tend to move toward increased entropy (disorganization) and less potential energy.
    • Cellular respiration is a series of exergonic reactions that convert glucose into less organized products (water, CO2) while releasing free energy for ATP synthesis.
    • Four interconnected processes maximize energy production:
      • Glycolysis
      • Pyruvate Oxidation
      • Citric Acid Cycle
      • Electron Transport Chain
    • The multiple steps ensure a gradual release of energy, minimizing heat loss and maximizing ATP production.

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    Description

    This quiz delves into the process of cellular respiration, highlighting key stages including glycolysis, pyruvate oxidation, and the citric acid cycle. Understand how ATP is generated from glucose as you explore each step of this vital metabolic pathway.

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