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Questions and Answers
What is the main purpose of cellular respiration?
What is the relationship between cellular respiration and photosynthesis?
Why do cells need to convert sugar into ATP?
What is the byproduct of cellular respiration?
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What is the reactant in cellular respiration?
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What is the energy currency of the cell?
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Why is cellular respiration necessary for life?
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What is the type of reaction that occurs during cellular respiration?
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What is energy defined as?
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What is the process by which plants convert carbon dioxide and water to sugar and oxygen?
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What is the source of energy for organisms on Earth?
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What happens to the energy used to make sugar during photosynthesis?
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Why is energy required for photosynthesis?
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What do organisms do to release the stored energy from sugar?
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What is the type of reaction that occurs during photosynthesis?
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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.
