Energy and Life: Organisms' Energy Source

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Questions and Answers

What is the name given to the process by which cells synthesize ATP?

  • Glycolysis
  • Cellular Respiration (correct)
  • Krebs Cycle
  • Photosynthesis

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

  • Oxygen (correct)
  • Water
  • Carbon Dioxide
  • ATP

Why is cellular respiration considered an exergonic reaction?

  • It occurs only in the presence of light.
  • It involves the synthesis of complex molecules.
  • It releases energy as a result of the reaction. (correct)
  • It requires energy input to proceed.

What is the primary reason cells cannot directly use sugar to do work?

<p>Sugar does not have the appropriate energy form for cellular processes. (A)</p> Signup and view all the answers

How is the relationship between cellular respiration and photosynthesis best described?

<p>They are reciprocal processes, with the products of one being the reactants of the other. (A)</p> Signup and view all the answers

Which of the following is the best analogy for why cells need to convert sugar into ATP?

<p>Converting a large bill into smaller denominations for easier spending. (A)</p> Signup and view all the answers

What is the primary function of ATP in cellular processes?

<p>Serving as the primary energy currency for cellular work. (C)</p> Signup and view all the answers

Which of the following is a key difference between cellular respiration and photosynthesis?

<p>Cellular respiration releases energy, while photosynthesis stores energy. (D)</p> Signup and view all the answers

What would happen to a cell if it were unable to carry out cellular respiration?

<p>The cell would be unable to perform many essential functions. (C)</p> Signup and view all the answers

Which of the following statements best describes the role of ATP in muscle contraction?

<p>ATP provides the energy needed for muscle fibers to shorten and contract. (B)</p> Signup and view all the answers

What is the primary source of energy for life on Earth?

<p>Energy from the sun (D)</p> Signup and view all the answers

What process do plants use to convert sunlight into sugar?

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

What type of reaction is photosynthesis considered to be?

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

How do organisms use the sugar produced by plants?

<p>They break it down to release stored energy. (A)</p> Signup and view all the answers

Which of the following is a requirement for photosynthesis to occur?

<p>Presence of chlorophyll (D)</p> Signup and view all the answers

What is energy defined as, in the context of organisms?

<p>The ability to do work (C)</p> Signup and view all the answers

What do plants release as a byproduct of photosynthesis?

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

Which of the following best describes the relationship between energy and work?

<p>Energy is needed to perform work. (C)</p> Signup and view all the answers

Which of the following is NOT a step in the process of photosynthesis?

<p>Conversion of glucose to starch (B)</p> Signup and view all the answers

What role does sunlight play in the photosynthesis process?

<p>It provides energy required for the reaction. (B)</p> Signup and view all the answers

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Study Notes

Energy in Living Organisms

  • All living organisms, including bacteria, plants, and animals, require energy for survival and reproduction.
  • Energy is defined as the ability to do work, which occurs when a force moves an object.

Source of Energy

  • On Earth, the primary source of energy is the sun.
  • Plants utilize sunlight to create sugar, which serves as an energy source for other organisms.

Photosynthesis

  • Plants transform sunlight into chemical energy through photosynthesis, converting carbon dioxide and water into sugar and oxygen.
  • This process is endergonic, meaning it requires energy to occur.
  • The sun's energy drives photosynthesis, and part of this energy is stored in the sugar molecules produced.

Energy Utilization by Organisms

  • Organisms obtain energy by breaking down sugar, a process known as cellular respiration.
  • The breakdown of sugar releases energy, which is used to synthesize adenosine triphosphate (ATP), the primary energy carrier in cells.
  • Cellular respiration is an exergonic reaction, releasing energy as sugar is converted into carbon dioxide and water.

Relationship Between Photosynthesis and Cellular Respiration

  • Photosynthesis and cellular respiration are interconnected; the products of one process serve as the reactants for the other.
  • Photosynthesis produces glucose and oxygen, which are used in cellular respiration to generate energy for cellular activities.

Importance of ATP

  • Cells cannot use sugar directly for energy; sugar must be converted into ATP to be usable.
  • ATP can be thought of like currency: just as different currencies need to be exchanged for purchasing goods, sugar must be converted into ATP for cellular work.
  • Muscle cells particularly rely on ATP for contractions, highlighting its vital role in cellular function.

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