Energy and Life
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Questions and Answers

What is the main purpose of cellular respiration?

  • To convert light energy into chemical energy
  • To produce carbon dioxide and water
  • To convert chemical energy from sugar into ATP (correct)
  • To synthesize sugar from carbon dioxide and water

    • What is the relationship between cellular respiration and photosynthesis?

  • They are unrelated processes
  • They occur simultaneously in cells
  • Cellular respiration is the reverse of photosynthesis (correct)
  • Photosynthesis is the reverse of cellular respiration

    • Why do cells need to convert sugar into ATP?

  • Because cells can't directly use sugar to do work (correct)
  • Because sugar is not a usable form of energy
  • Because ATP is a more efficient form of energy
  • Because ATP is a more stable molecule than sugar

    • What is the byproduct of cellular respiration?

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

    What is the reactant in cellular respiration?

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

    What is the energy currency of the cell?

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

    Why is cellular respiration necessary for life?

    <p>Because it converts sugar into ATP</p> Signup and view all the answers

    What is the type of reaction that occurs during cellular respiration?

    <p>Exergonic reaction</p> Signup and view all the answers

    What is energy defined as?

    <p>The ability to do work, where work is done when a force moves an object</p> Signup and view all the answers

    What is the process by which plants convert carbon dioxide and water to sugar and oxygen?

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

    What is the source of energy for organisms on Earth?

    <p>The sun</p> Signup and view all the answers

    What happens to the energy used to make sugar during photosynthesis?

    <p>Some of it is stored in the sugar molecule</p> Signup and view all the answers

    Why is energy required for photosynthesis?

    <p>To put the carbon dioxide and the water molecules together to form sugar</p> Signup and view all the answers

    What do organisms do to release the stored energy from sugar?

    <p>They break down the sugar to release its stored energy</p> Signup and view all the answers

    What is the type of reaction that occurs during photosynthesis?

    <p>Endergonic reaction</p> Signup and view all the answers

    Study Notes

    Energy and Life

    • All living organisms require energy to survive and reproduce.
    • Energy is the ability to do work, which is done when a force moves an object.

    Sugar as Energy

    • Organisms use sugar as a source of energy to do work.
    • Energy from sugar is used to perform various functions, such as turning on a computer, getting out of bed, listening to a lesson, and reproducing.

    Energy from the Sun

    • On Earth, energy ultimately comes from the sun.
    • Plants use the sun's energy to make sugar through photosynthesis.

    Photosynthesis

    • Photosynthesis is the process by which plants use sunlight to convert carbon dioxide and water into sugar and oxygen.
    • This is an endergonic reaction, meaning energy is required to drive the reaction.
    • The sun provides the energy needed to drive photosynthesis.

    How Organisms Use Energy from Sugar

    • Organisms break down sugar to release its stored energy.
    • The energy released is used to synthesize adenosine triphosphate (ATP) through cellular respiration.
    • Cellular respiration is an exergonic reaction, releasing energy as sugar is broken down into carbon dioxide and water.

    Cellular Respiration

    • Cellular respiration is the reverse of photosynthesis, as the products of one become the reactants for the other.
    • Cells convert energy stored in sugar into energy stored in ATP, as sugar cannot be directly used to do work.
    • ATP is used by cells to perform various functions, such as muscle contractions.

    Analogy of Energy

    • Energy can be compared to money, where sugar is like foreign currency (e.g., Japanese yen) that needs to be converted into a usable form (e.g., dollars) to be spent.
    • Similarly, sugar needs to be converted into ATP to be used by cells to do work.

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    Description

    This quiz covers the concept of energy in living organisms, including its importance for survival and reproduction.

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