Respiration and Yeast Experiment
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Questions and Answers

What is the primary product of aerobic respiration?

  • Lactic Acid
  • Glucose
  • Carbon Dioxide and Water (correct)
  • Ethanol

    • Aerobic respiration does not require oxygen.

    False (B)

    What is the effect of temperature on the respiration rate of yeast?

    Increase in temperature generally increases the respiration rate, up to a certain point.

    During anaerobic respiration in muscles, glucose is converted into ______.

    <p>lactic acid</p> Signup and view all the answers

    Match the type of respiration with its description:

    <p>Aerobic Respiration = Requires oxygen and produces more energy Anaerobic Respiration = Occurs without oxygen, producing less energy Lactic Acid Fermentation = Occurs in muscles during vigorous exercise Alcoholic Fermentation = Occurs in yeast producing ethanol and carbon dioxide</p> Signup and view all the answers

    What is the role of enzymes in respiration?

    <p>To speed up chemical reactions (A)</p> Signup and view all the answers

    What happens to methylene blue dye during the investigation of respiration in yeast?

    <p>It changes from blue to colorless.</p> Signup and view all the answers

    Anaerobic respiration produces more energy per glucose molecule than aerobic respiration.

    <p>False (B)</p> Signup and view all the answers

    What is the main purpose of respiration in living cells?

    <p>To break down nutrient molecules to release energy (C)</p> Signup and view all the answers

    Anaerobic respiration in yeast produces lactic acid.

    <p>False (B)</p> Signup and view all the answers

    What indicator is used to investigate the effect of temperature on yeast respiration?

    <p>Methylene Blue</p> Signup and view all the answers

    During aerobic respiration, glucose combines with ______ to release energy.

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

    Match the type of respiration with its main output:

    <p>Aerobic Respiration = Carbon Dioxide and Water Anaerobic Respiration in Yeast = Ethanol and Carbon Dioxide Anaerobic Respiration in Muscles = Lactic Acid</p> Signup and view all the answers

    What happens to methylene blue dye during the respiration experiment with yeast?

    <p>It loses its color (B)</p> Signup and view all the answers

    The condition of needing extra oxygen after exercise is called ______.

    <p>oxygen debt</p> Signup and view all the answers

    Flashcards

    Respiration

    Chemical reactions that break down nutrient molecules in cells to release energy.

    Aerobic Respiration

    Releases energy from nutrients using oxygen.

    Anaerobic Respiration

    Releases energy without using oxygen.

    Lactic Acid

    A byproduct of anaerobic respiration in muscles during exercise.

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    Oxygen Debt

    Extra oxygen needed after exercise to remove/process lactic acid, restore cells.

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    Glucose

    A type of sugar used in respiration.

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    Respiration rate

    The speed at which respiration occurs.

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    Effect of Temperature on Respiration

    How changes in temperature affect the speed/rate of respiration in cells (e.g., yeast).

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    What is respiration?

    Chemical reactions within living cells that break down nutrient molecules to release energy.

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    What are the uses of energy in the body?

    Energy released from respiration is used for various functions like muscle contraction, protein synthesis, cell division, active transport, growth, nerve impulses and maintaining body temperature.

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    How does temperature affect respiration?

    Temperature influences the rate of respiration. Increasing temperature generally speeds up respiration until an optimal point, after which the rate slows down.

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    What is aerobic respiration?

    Chemical reactions that break down nutrients in cells using oxygen to release energy.

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    What are the products of aerobic respiration?

    Carbon dioxide and water are produced as byproducts of aerobic respiration.

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    What is anaerobic respiration?

    Chemical reactions that break down nutrients in cells to release energy without using oxygen.

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    What are the products of anaerobic respiration in muscles?

    Lactic acid is produced as a byproduct of anaerobic respiration in muscles during intense exercise.

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    What is oxygen debt?

    The extra oxygen your body needs after exercise to convert lactic acid back to glucose and to replenish energy stores.

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    Study Notes

    Respiration

    • Respiration is the chemical breakdown of nutrient molecules in cells to release energy.
    • Energy is used for various bodily functions: muscle contraction, protein synthesis, cell division, active transport, growth, nerve impulses, and temperature regulation.
    • Enzymes speed up these reactions.

    Effect of Temperature on Yeast Respiration

    • Methylene blue is used as an indicator to measure respiration rate in yeast.
    • The faster the dye loses color, the faster the respiration rate.
    • Independent Variable (IV): Temperature
    • Dependent Variable (DV): The time it takes for methylene blue to decolorize (measuring respiration rate).
    • Aerobic respiration used to measure the rate (using oxygen).

    Aerobic Respiration

    • Aerobic respiration uses oxygen to break down nutrients for energy.
    • Chemical equation: Glucose + Oxygen → Carbon Dioxide + Water
    • Chemical formula: C6H12O6 + 6O2 → 6CO2 + 6H2O

    Anaerobic Respiration

    • Anaerobic respiration does NOT use oxygen to break down nutrients for energy.
    • Different products depending on the organism
      • In muscles (during vigorous exercise): Glucose → Lactic Acid
      • In yeast (single-cell fungi): Glucose → Ethanol + Carbon Dioxide
    • Chemical equation for yeast: C6H12O6 → 2C2H5OH + 2CO2.

    Disadvantages of Anaerobic Respiration

    • Anaerobic respiration produces far less energy (about 1/20th) than aerobic respiration per glucose molecule.
    • Anaerobic respiration produces lactic acid, which is toxic.

    Lactic Acid

    • Buildup in muscles and blood during strenuous exercise.
    • The body needs extra oxygen to process the lactic acid afterward.

    Oxygen Debt

    • Post-exercise need to breathe heavily to supply the extra oxygen required.
    • Body removes oxygen debt through:
      • Sustained increased heart rate to carry lactic acid to the liver.
      • Sustained increased breathing to provide oxygen for aerobic processes.
      • Liver's aerobic processing of lactic acid.

    Comparison of Aerobic and Anaerobic Respiration

    Feature Aerobic Respiration Anaerobic Respiration
    Oxygen needed Yes No
    Glucose breakdown Complete combustion Incomplete combustion
    Products Carbon Dioxide and Water Animals: Lactic Acid, Yeast: Carbon Dioxide and Ethanol
    Energy released More Less

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    Description

    This quiz explores the process of respiration, focusing on yeast and the effect of temperature on its respiration rate. Understanding aerobic respiration and the use of methylene blue as an indicator are key components. Test your knowledge of these biological processes and their importance in energy release.

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