Cellular Respiration Overview
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Questions and Answers

How much ATP is produced during the electron transport chain?

  • 20 ATP
  • 12 ATP
  • 2 ATP
  • 34 ATP (correct)

    • Which process is primarily responsible for recycling NADH and FADH2 in the absence of oxygen?

  • Krebs Cycle
  • Fermentation (correct)
  • Glycolysis
  • Electron transport chain

    • What is the by-product of lactic acid fermentation?

  • Carbon dioxide
  • Lactic acid (correct)
  • Acetic acid
  • Ethyl alcohol

    • Which of the following statements about anaerobic pathways is true?

    <p>They only involve glycolysis. (D)</p> Signup and view all the answers

    How many ATP molecules are produced through glycolysis?

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

    What is the primary purpose of cellular respiration?

    <p>To produce ATP from the breakdown of glucose (B)</p> Signup and view all the answers

    In which stage of aerobic respiration does glycolysis take place?

    <p>In the cytosol (C)</p> Signup and view all the answers

    What are the main end products of the Krebs Cycle?

    <p>Carbon dioxide, ATP, NADH, and FADH2 (A)</p> Signup and view all the answers

    How many ATP molecules are produced during the complete aerobic metabolism?

    <p>38 (A)</p> Signup and view all the answers

    Which of the following statements is true about the anaerobic pathway?

    <p>It produces ATP in the absence of oxygen (A)</p> Signup and view all the answers

    What role does oxygen play in the electron transport chain?

    <p>It serves as the final electron acceptor (B)</p> Signup and view all the answers

    Which substance is broken down during glycolysis?

    <p>Glucose (D)</p> Signup and view all the answers

    Which by-products are produced during the glycolytic breakdown of glucose?

    <p>ATP, carbon dioxide, and water (B)</p> Signup and view all the answers

    Flashcards

    Cellular Respiration

    A series of catabolic reactions breaking down glucose to produce ATP, the cell's energy currency.

    Aerobic Pathway

    Cellular respiration in the presence of oxygen; producing significantly more ATP compared to anaerobic.

    Anaerobic Pathway

    Cellular respiration in the absence of oxygen; producing significantly less ATP compared to aerobic method.

    Glycolysis

    The first stage of the aerobic pathway; breaking down glucose into pyruvate, producing 2 ATP molecules.

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    Krebs Cycle

    The second stage of the aerobic pathway; processing pyruvate to generate CO2, ATP, and electron carriers.

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    Electron Transport Chain(ETC)

    The third stage of the aerobic pathway; using high-energy electrons to produce large amounts of ATP.

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    ATP

    Adenosine triphosphate; the cell's primary energy currency.

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    Pyruvate

    The end product of glycolysis; the fuel for the Krebs cycle.

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    Fermentation

    A type of anaerobic pathway where pyruvate is broken down to produce small amounts of ATP and byproducts like lactic acid or ethyl alcohol.

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    Lactic Acid Fermentation

    A type of fermentation where pyruvate is converted into lactic acid. Used by animals and certain bacteria.

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    Alcohol Fermentation

    A type of fermentation where pyruvate is converted into ethyl alcohol and carbon dioxide. Used by yeast and some bacteria.

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    What's the overall energy output of fermentation?

    Fermentation produces only 2 ATP molecules. These come solely from glycolysis.

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    Study Notes

    Cellular Respiration Overview

    • Cellular respiration is a series of catabolic reactions that break down glucose to produce ATP (adenosine triphosphate).
    • ATP serves as the primary energy currency of cells, transporting energy to power vital reactions.
    • Glucose is oxidized to form carbon dioxide, while oxygen is reduced to form water.
    • This process releases usable energy in the form of ATP.

    Energy Pathways

    • Cellular respiration involves two main pathways: aerobic and anaerobic.
    • Aerobic respiration requires oxygen to function, while anaerobic respiration does not.

    Aerobic Respiration Stages

    • Aerobic respiration has three stages: Glycolysis, Krebs Cycle, and Electron Transport Chain (ETC).
    • Glycolysis: Glucose is broken down into pyruvate in the cytosol, producing 2 ATP molecules. Pyruvate is then transferred to the mitochondria.
    • Krebs Cycle (Citric Acid Cycle): Pyruvate enters the mitochondria and is further oxidized, producing 2 ATP molecules, carbon dioxide, NADH, FADH2, and high-energy electrons.
    • Electron Transport Chain (ETC): High-energy electrons from NADH and FADH2 are passed along a chain, culminating in the synthesis of 34 ATP molecules with oxygen and hydrogen.

    Anaerobic Respiration Stages

    • Anaerobic respiration has two stages: Glycolysis and Fermentation.
    • Glycolysis: Glucose is broken down into pyruvate, producing 2 ATP molecules.
    • Fermentation: Pyruvate is further processed in the absence of oxygen to regenerate NAD+ for glycolysis. This results in only 2 ATP molecules.

    Types of Fermentation

    • Lactic Acid Fermentation: Occurs in animals and some bacteria, producing lactic acid and regenerating NAD+.
    • Alcohol Fermentation: Occurs in microorganisms like yeast, producing ethanol and regenerating NAD+.

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    Related Documents

    Cellular Respiration PDF

    Description

    Explore the fundamentals of cellular respiration through this quiz, covering both aerobic and anaerobic pathways. Understand how glucose is metabolized to produce ATP and the stages involved in aerobic respiration. Test your knowledge on key concepts and processes integral to cellular energy production.

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